I’ll recommend you use any cex exchange since you’re still very new to it. There are several that you can buy little amount of bitcoin from and still withdraw without having to undergo KYC verification.

Or if you could get someone that you know that wants to sell some of their coin, you can buy from them and that would be more safer.

You can still go through this link^[1] to learn more and follow the ones that’s more suitable to you.

[1] http://www.coindesk.com/information/how-can-i-buy-bitcoins/
https://www.coinbase.com/buy-bitcoin

I think you’ve already gotten the answer you deserve from the first two replies but adding to it is that you should always add two factor authentication to every thing including buying and selling of your coins and I wouldn’t want to mention names but I think Paxful(DYOR) is a nice place to get your coins including buying and selling without much stress as their entire process seems simple and they also offer some sort of escrow to make sure the funds are secure.

If you’re in Nigeria, I also offer a private exchange and I also help to make the process easier since I also offer some sort of private exchange and if you have gift card, I also accept all country gift cards and send you bitcoin.

Well for starters, I think binance CEX is probably okay to use as it's very easy to navigate and you would probably get Bitcoin for a good rate through easy by either purchasing through p2p service. But then if you are planning to store and keep the coins for a long time, then I would advise that  you would probably move it out and save it in a more secure wallet, maybe a non-custodial wallet like electrum wallet.

Are you planning to make the title bold? it doesn't seem to work and you can edit the post and remove the code {b] [b}

How to buy bitcoin is easy, you only need to visit several exchange links that other members have mentioned above or you can look for a local exchange in your country (if there is one). You just create an account on the exchange, how many bitcoins you want to buy, make payment, done. Everything will run automatically and quickly

I am sure all the comments above have already said everything you will need, but I will like to make this a reminder for you. Your account is still new, so my people will want to make use of the opportunity of your being new here to scam you. People will send you personal messages trying to help you, and I will tell you that most of them are just scammers trying to take from you. Anyone that’s trying to assist you will not send you a personal message; they will post the steps that you are going to take on this thread so that everyone will be able to see them. So stay away from anyone trying to help you privately.

Oh..he Mr. OP, you used it in the title of the topic, but it didn't work there, basically you shouldn't have given the subject that way. So you fix it by editing it, but it will look good.
Notice that I have corrected your mistake and posted it.

If you don't understand how to buy bitcoins, then don't go for it, or you could lose money to scammers. So I will tell you first of all you should know about cryptocurrency first, because there are many scammers in cryptocurrency they can cheat you. Prepare to invest in bitcoins when you understand better, moreover you can use a good exchange to buy bitcoins. Among the safe and good exchanges you can use is Binance and Kucoin. Here you can buy your bitcoins from p2p with maximum security. And be sure to use a good hardware wallet to keep your bitcoins in a safe place, it will provide maximum security for your money. If you want to invest bitcoins for a long time, then definitely use a wallet with good security.