Learn crypto in this order: what a blockchain does, how Bitcoin and Ethereum work, how wallets and keys control your coins, how scams work, what legal protections you don't have, and how taxes apply. Read primary sources where you can, such as the Bitcoin white paper, the US government's NIST overview, ethereum.org and a free MIT course. Leave buying decisions until you understand those steps. Security comes first because mistakes are expensive. The FBI's Internet Crime Complaint Center (IC3) says crypto-related complaints in 2025 reported about $11.4 billion in losses, the most of any category.
Step 1: Understand what a blockchain is
Start with two short documents, not videos.
- The Bitcoin white paper. Bitcoin: A Peer-to-Peer Electronic Cash System by Satoshi Nakamoto is nine pages long and is hosted on bitcoin.org. It explains the problem Bitcoin was built to solve: sending payments online without a trusted middleman, while stopping anyone from spending the same coin twice.
- **NIST IR 8202, Blockchain Technology Overview.** This is a free report from the US National Institute of Standards and Technology, published in October 2018. It was written by Dylan Yaga, Peter Mell, Nik Roby and Karen Scarfone. It describes blockchains as "tamper evident and tamper resistant digital ledgers" that run without a central repository and usually without a central authority.
After these two, you should be able to explain four things in your own words: what a ledger is, why many computers keep copies of it, how new blocks get added, and why a confirmed record is hard to change.
Step 2: Learn how Bitcoin and Ethereum actually work
These two networks have the longest histories and the most documentation, so they are the clearest examples to learn from.
Bitcoin
- Fixed supply. bitcoin.org states that "only 21 million bitcoins will ever be created."
- Halvings. New bitcoins are paid to miners as a block subsidy. The subsidy halves every 210,000 blocks, which is roughly every four years. The fourth halving happened at block 840,000 on 20 April 2024 and cut the subsidy from 6.25 to 3.125 BTC.
- Miner payment. Bitcoin's developer documentation says the first transaction in every block is a generation transaction. It collects the block reward: the subsidy plus any transaction fees.
- No undo button. bitcoin.org says that "Bitcoin transactions are irreversible: once confirmed, they can only be refunded by the person receiving the funds." The same page notes that the price "is still very volatile."
Ethereum
- Ethereum runs programs called smart contracts. Most decentralised finance (DeFi) applications and NFTs are built from them.
- On 15 September 2022, Ethereum switched from proof of work to proof of stake in an upgrade called The Merge. According to ethereum.org, the switch cut the network's energy use by about 99.95%.
Check yourself: can you explain the difference between proof of work, where miners spend computing power, and proof of stake, where validators lock up coins as collateral? If not, reread before moving on.
Step 3: Learn wallets and keys before you hold anything
A wallet doesn't store coins. It stores the keys that let you move coins recorded on the blockchain. Many wallets give you a recovery phrase (also called a seed phrase) that can rebuild those keys. Anyone who has that phrase controls your funds.
Practical rules:
- Never type an address by hand. ethereum.org warns: "Avoid typing any Ethereum address manually. This can easily lead to clerical errors and lost funds." Copy and paste the address or scan its QR code, then check the first and last characters.
- Match the network. Some tokens exist on several networks, and those copies are "not interchangeable" (ethereum.org). Sending a token on the wrong network can mean losing it.
- Confirmed means final. "Once a transaction is confirmed, you cannot cancel the transaction" (ethereum.org).
- Use a block explorer. Explorers show the status of any public transaction. Learn to read one before you send anything.
- Keep the recovery phrase offline and private. Nobody legitimate needs it. A request for it is a reason to stop.
Step 4: Learn how crypto scams work
This step protects your money more than any other.
What the latest data shows. The FBI's 2025 Internet Crime Report was released in April 2026. It counted about 181,600 crypto-related complaints in 2025, with reported losses of over $11 billion. Crypto investment fraud alone accounted for $7.2 billion. Separately, IC3 received more than 13,400 complaints about crypto ATMs and kiosks in 2025, with losses above $388 million, up 58% from 2024.
Warning signs from the US Federal Trade Commission (FTC):
- "Only scammers demand payment in cryptocurrency."
- "Only scammers will guarantee profits or big returns."
- "Never mix online dating and investment advice."
- "No legitimate business or government will ever email, text, or message you on social media to ask for money."
- "Never click on a link from an unexpected text, email, or social media message."
The FTC also points out that "Cryptocurrency payments do not come with legal protections" and "typically are not reversible." In practice, money sent to a scammer is usually gone.
Step 5: Know which protections don't apply
Beginners often assume crypto held with a company is protected the way bank deposits are. In the US it usually isn't.
| Protection | Does it cover crypto? | What the agency says |
|---|---|---|
| FDIC deposit insurance | No | FDIC insurance does not apply to crypto assets. It also does not protect against the failure of non-bank companies, including crypto custodians, exchanges, brokers and wallet providers (FDIC fact sheet, 28 July 2022). |
| SIPC (US brokerage accounts) | Generally no | "SIPC does not protect any digital or crypto asset that does not qualify as a 'security'." Unregistered digital asset securities are not protected "even if held by a SIPC-member brokerage firm." |
Protections in other countries are different. Check your own regulator's rules.
Should you stop before sending crypto?
Answer five questions about a transfer you are about to make to see which warning sign or wallet rule from this guide applies.
Has anyone asked you for your recovery phrase (seed phrase)?
- Yes → Stop: never share the phrase
- No → next question
Did this request start with an unexpected text, email or social media message, or with someone you met through online dating?
Is anyone guaranteeing profits or big returns, or insisting that you pay in cryptocurrency?
Did you paste or scan the receiving address, then check its first and last characters?
- Yes → next question
- No, I typed it or didn't check → Fix the address first
Are you sending the token on the same network the recipient expects?
- Yes, I've confirmed it → These checks passed, but confirmed means final
- No or not sure → Confirm the network first
Anyone who has your recovery phrase controls your funds. Nobody legitimate needs it, so a request for it is a reason to stop.
The FTC says only scammers demand payment in cryptocurrency or guarantee profits, and that no legitimate business or government will message you asking for money. Crypto payments do not come with legal protections and typically are not reversible.
ethereum.org warns that typing an address by hand can easily lead to clerical errors and lost funds. Copy and paste it or scan its QR code, then check the first and last characters.
Copies of a token on different networks are not interchangeable, and sending on the wrong network can mean losing it. Check which network the recipient expects before you send.
Once a transaction is confirmed you cannot cancel it. Use a block explorer to follow its status after you send.
This covers only the warning signs and wallet rules in this guide: it cannot verify a recipient, a project or a transaction, and it is not investment advice.
Step 6: Understand the tax basics (US example)
- The IRS says: "For U.S. tax purposes, digital assets are considered property, not currency." Selling, swapping or spending crypto can create a taxable gain or loss.
- Form 1040 asks every filer a yes-or-no digital asset question. Only holding crypto, or moving it between your own wallets, does not on its own require a "yes."
- From 1 January 2025, brokers must report digital asset sales to the IRS on the new Form 1099-DA. For 2025 sales they report gross proceeds but don't have to report cost basis, so many taxpayers will need to work out their basis themselves. Basis reporting applies to certain transactions from 1 January 2026.
If you live outside the US, look up your own tax authority's guidance before you trade.
Step 7: Go deeper with free university material
- **MIT OpenCourseWare, 15.S12 Blockchain and Money (Fall 2018).** Gary Gensler's graduate course starts with Bitcoin and the basics of blockchains, distributed ledgers and smart contracts. It then covers uses in payments, central banking, trade finance and digital ID, plus the regulation of crypto, token sales and crypto derivatives. Lectures and readings are free under a Creative Commons licence.
- Bitcoin and Cryptocurrency Technologies (Princeton University Press, 2016) by Arvind Narayanan, Joseph Bonneau, Edward Felten, Andrew Miller and Steven Goldfeder. A technical textbook for readers who want the cryptography and mechanics in detail.
Terms you will meet early
- Private key / recovery phrase: the secret that controls funds. Whoever holds it controls the coins.
- Gas or network fee: what you pay to have a transaction processed. It rises when the network is busy.
- Market cap: price multiplied by circulating supply. It measures size, not safety.
- Liquidity: how easily something can be bought or sold without moving its price.
- Slippage: the gap between the price you expected and the price you got.
- Stablecoin: a token designed to track another asset, usually the US dollar.
- Decentralised exchange: a smart contract that swaps tokens from liquidity pools that users fund, with no company holding your funds.
- Bull / bear market: a period of mostly rising or mostly falling prices.
- FOMO / FUD: fear of missing out, and fear, uncertainty and doubt. Both describe emotional decisions.
- Pump and dump: a scheme where promoters inflate a price, then sell to latecomers.
How to research any token
Before you spend money on any project, answer these questions in writing:
- Supply: Is there a maximum supply? How many new tokens are created, and who receives them?
- Unlocks: When can the team and early backers sell? Large scheduled unlocks add selling pressure.
- Purpose: What does the token do that couldn't be done without it?
- Code and team: Is the code public? Has it been audited, and by whom? Are the developers identifiable?
- Documentation: Can you read the white paper and understand the basics? If you can't, treat that as a warning sign.
- Promotion: Is anyone promising returns? According to the FTC, guaranteed profits are a sign of a scam.
A four-week starting plan
- Week 1: read the Bitcoin white paper and NIST IR 8202, and write a one-paragraph summary of each.
- Week 2: study Bitcoin's supply rules and Ethereum's proof of stake, then use a block explorer to follow a few public transactions.
- Week 3: set up a wallet with no money in it, practise backing up its recovery phrase, and work through the FTC scam list.
- Week 4: read the FDIC, SIPC and IRS pages, or your own country's equivalents, then start the MIT course.
Limitations: the loss figures cover only complaints reported to the FBI, the protection and tax rules shown are US-specific, and this guide is education, not investment advice.
