Now my main aim of creating this thread is that a friend asked me to send my BTC wallet address so that he can send me Bitcoin for me to sell it and send him fiat, but I am curious because of my safety since I don't know the source of his BTC if he got it by scamming someone. A thought cam to me that this might be a risky transaction and I don't want to send him my exchange wallet address.
So you're using an exchange address to store your crypto? That sounds like a bad idea (unless I misunderstand you). Anyway, do you ask him why he wanted to sell his coins to you? I can't imagine telling my friend to buy my coins out of nowhere unless I know he's interested in crypto in the first place. There are many options for P2P trades in my area, too, so that's that.
I just hope it isn't about some broken account that tries to push something up from the account of a pal...
Otherwise - everything should be well suited for P2P, you are right.