Course outline
- 1What a crypto wallet is, and where the coins actually live
- 2Custodial vs non-custodial wallets: whose keys are they
- 3Types of crypto wallet: hot, cold, extensions and hardware
- 4The seed phrase: what it is and why you tell it to nobody
- 5Address, private key and password: how they differ
- 6Where to download a wallet without installing a fake
- 7How to install MetaMask and create a wallet
- 8How to install Rabby: a wallet for many EVM chains
- 9Phantom: a Solana wallet and how to download it
- 10Tonkeeper: how to get a wallet on TON
- 11Hardware wallets: why Ledger and Trezor, and where to buy them
- 12An exchange wallet: convenient, but the keys are not yours
- 13What DeFi is, in plain language
- 14CEX and DEX: where to swap, and what that implies
- 15Gas: why a swap will not send without ETH, SOL or TON
- 16How to buy crypto: fiat, exchange, network, DEX
- 17How to swap tokens on Uniswap (EVM)
- 18How to buy a token on Jupiter (Solana)
- 19How to swap a jetton on STON.fi (TON)
- 20Phishing: where you never type a seed phrase
- 21Why a tracker asks for an address, not a seed phrase
- 22How to check the purchase arrived: network, address, tracker
- 23Wallet security: short rules that actually work
- 24Twitter / X: how to find a project's real account and skip the clone
- 25DefiLlama: where to find a project's real site and Twitter
A crypto wallet looks like an app with a balance. It feels as if the coins sit in the phone, like photos. They do not.
The coins live on the blockchain — the network's shared ledger. The wallet stores the keys you use to sign "yes, I am sending this". Without the key, the balance on screen is a picture. With the key, it is the right to spend.

What you see on screen
The address (on EVM it starts with 0x) is the public shopfront. You can share it for a transfer. The seed phrase and the private key are the right to spend. You do not give those to anyone, including "support".
The three objects are unpacked here: address, key and password.
Why have your own wallet
On an exchange you have a login. The exchange can freeze withdrawals, get hacked, or lose the account through email. A non-custodial wallet means the keys are yours. The price is responsibility. Lose the seed and the money is gone — there is no bank chargeback.
When you want an exchange account and when you want your own address: custodial vs non-custodial.
What a wallet cannot do
It does not insure the price. It will not warn you that a token is junk. It will not undo a transfer to the wrong network. Once you sign, the network executes.
That is why a tracker that only *reads* the address sits next to the wallet: Crypto360 never asks for a seed and cannot withdraw.