First thing you should be learning is how to secure your coins and doing so it means securing your wallet and for best wallet control you need a cold wallet or other wallets that give you the freedom to your assets and control through recoverable keys, this is the first steps.

Secondly you head straight to exchange to buy your bitcoin through fiat and once that is done you have them transferred into your wallet for safe keeping and full control.

Just avoid leaving large funds on exchange wallet regardless of the easy accessibility their promises.