Bitcoin can be bought easily on exchanges like Binance or Bitget; just fund your account, then buy or sell instantly
It can be bought easily and is very convenient if the person who wants to buy it comes from a country where crypto is legal and those exchanges are allowed in that country, which will make it easier for the person to pass verification and use their payment method without any trouble.
The first easy step starts with easy verification. But if you are from a place where crypto is not easy to buy, then you will need a little bit of research before you can buy bitcoin and hold it. It's when you know your way around restrictions that everything can be considered to be simple and easy.