Paxful (
click for link) is extremely simple to use and has decent support in my experience in case things happen to go wrong. You won't need to submit any form of KYC for most BTC transactions depending on what payment method you're using. Generally speaking, you're going to get the best rates with a bank transfer and less with a reversible payment method like PayPal and the least with gift cards. BTC sellers accepting reversible payment methods like PayPal also usually ask for an ID of some type on the site (though there are some with worse rates that do not require an ID), but generally speaking the site is excellent for a mostly anonymous fiat to crypto conversion.
The Currency Exchange section of this forum (
click for link) also works as others have mentioned here, though you'll need some reputation if you're trying to buy BTC for a reversible payment method like PayPal.