After you are done with this three tips, register on a reputable exchange like bybit or any other one you know is ok by you, set up you own custodial bitcoin wallet for storing your bitcoins then begin with a small bitcoin investment to get familiar with the process and continously educate yourself on bitcoin and the crypto market.
I believe say you been wan write non custodial and not custodial wallet because to say na wetin you been mean to write, they're the worst set of wallet that you can own because of their censorship and they detect what you can or can't do.
Custodial wallets na those one wey no dey give you private keys and they have you linking your email or other sensitive information like KYC verification to your account. Them just dey like your typical exchange which goes to my next point that you don't basically need an exchange to purchase Bitcoin.
You can do that from P2P platform as this forum can serve as that but if you wan they do your thing yourself without anybody personal to you knowing about your purchases then opening an exchange for buying and selling is ideal.
I agreed with you totally @CryptopreneurBrainboss, you have just spoken all about the non custodial wallet on how it works and you went further by analyzing custodial wallet on it works also, in which I'm very glad to have come across this your post.