Your question strikes me as a little odd because you've been on the forum for a couple of months now, and it's something you could have figured out for yourself instead of waiting for someone to hand it to you on a silver platter. But I've looked at your post history and I see that you were mining. Why do you want to buy bitcoin? Is it because your miner broke down? Or because it's not profitable for you? (I imagine you were mining altcoins, which you could swap for bitcoin.)
By the way, I've noticed that you're using the forum responsibly, and I've chosen one of your posts to give you a merit for. It's a shame I can't help you with what you asked about in it.
My hunch is that OP is familiar with or has heard about the traditional and easier way, which is through a centralized exchange.
So, without meaning to be judgmental... I imagine he left this question open-ended to see if there were any other option beyond the most basic. correct?
This certainly depends a lot on the country he lives in, but I will leave the options here and OP can research further and see if they make sense for him...
P2P (peer to peer): Its not exactly easy or safe... really depends on the person you are trading with, but if you know how to use platforms like Bisq for example, you can make good trade without having to go through the KYC process of centralized platforms. And here at Bitcnoitalk you can also find trustworthy people willing to negotiate buy/sell.
Bitcoin ATMs: Are there any in your area? Search for it.... its an great way to get Bitcoin easily by paying with cash or credit card... it doesn't get any faster or simpler than that.