What self-custody actually means
With a self-custody wallet, your recovery phrase and private keys control the funds. The wallet app is a tool for using those keys; it is not the owner of your assets. If someone else obtains the phrase, they can control the wallet from another device.
Write the recovery phrase down and store it securely offline. Do not photograph it, upload it, or share it with anyone. There is no legitimate exception for support, a DEX, an airdrop, or an account verification request.
Connecting a wallet is not the same as approving a trade
Connecting generally lets a website view your public address and request actions. It does not by itself move funds. Funds move only when you approve or sign a transaction in the wallet, which is why every subsequent prompt deserves attention.
Use the wallet's connection manager to review and remove sites you no longer use. Connecting only to legitimate domains, limiting browser extensions, and keeping wallet software updated are practical habits that reduce exposure to phishing.
Understand token approvals and swap transactions
Many DEX swaps require an approval before the swap. An approval lets a specified smart contract spend a specified token from your wallet under its terms. Read the token and contract context before signing; do not treat the approval as a harmless formality.
The swap transaction then sends the transaction to the chain. Check the selected network, input token, output token, estimated output, price impact, gas cost, and wallet address. If any part is unfamiliar, reject it and research before trying again.
Prepare for the responsibility
Keep enough native token for gas, especially on a new network. Use a small test amount when learning a route. Do not connect a wallet holding more than you are comfortable managing through an unfamiliar application.
DEX trading carries market, smart-contract, liquidity, and user-error risks. Self-custody is control, not a guarantee of safety or profit. This is educational information, not financial advice.