What country do you reside? I think there are others like you who are into crypto from your country so they would definitely be an exchange that services from your country.

Just like other members mentioned, Buying and selling of crypto is being carried out on Exchanges where you can deposit money directly into the exchange and trade it with Btc or make use of p2p services on the exchange where there are merchants readily available to buy or sell bitcoin and other cryptocurrencies. So also there members of the forum that offers such services, they buy and sell crypto but you just need to be careful who you deal with so you don’t get scammed. Before you proceed with the trade make sure the person is a reputable member that is trusted.

Ps: Never store your purchased crypto in an exchange - Not Your Keys Not Your Coin.