Accessing your exchange
Never click on the top ads results in Google in order to avoid spoofed phishing websites mirroring legit exchanges, bookmark your favorite exchanges in your browser or on your desktop, and always triple-check that the URL address is legit.
Moving your ADA
Always double-check (or triple-check) that the destination address has not been automagically changed, whether by accident or malicious intent, and is actually as intended. Unless in a situation where it would cause confusion (e.g. receiver sees one transation and thinks the amount is wrong), do a test transaction first with a few coins in order to build confidence, then send the rest.
Storing your ADA
There are several options possible such as (from most secure to less secure): hardware wallets (a cryptographically secure device dedicated to storing cryptocurrencies, such as the Ledger Nano S, Trezor etc...), paper wallets (your seed is written on a piece of paper with a QR code), hot wallets (browser-based wallets), and lastly, exchanges (not recommended). When leaving your coins on exchanges, you are not the owner of the private keys. See Comparison of Ada wallets and exchanges
Storing your seed
Never ever store your seed on anything connected to the internet. Make sure you wrote it down on a sheet of paper, did a back-up of it, and keep them somewhere safe. This seed, also called list of secret words, is what gives you access to your coins. Losing them means losing your money.
Do Your Own Research (DYOR)
With cryptocurrencies, you are responsible for your own security and your own money. Do your own due diligence.
The Cardano Wiki Team cannot be hold responsible for any losses. Buying, selling and investing in cryptocurrencies is not without risk.