Depends on where you live. If you live in a place like USA or China than there are big places like coinbase and binance for you. However, if you live in a place where no major exchange exists than the best way to approach bitcoin as a beginner is use a local website.

Each country has their own bitcoin-fiat exchange however small it is, that way you can definitely start getting some bitcoin and still be capable of changing it back to cash quite easily. If you live in a country where coinbase can't send money than there is no point of having an account there considering you are just starting out.