You are welcome to the forum, and I am happy to say to you that you have come to the right place, because here is where you will have all the information that you need about bitcoin and even other alt coins.
My suggestion for what I will say to you is that you should understand bitcoin first before you invest in it, because it is of no use to invest your money in something you know nothing about, so you should know and understand how bitcoin works. If you have done that, no one will tell you the amount to invest. You will know the amount to invest when you understand how bitcoin works.
Actually, investing in bitcoin is profitable, but understand it first before you invest because if you depend on the suggestions of others, you will end up blaming them. You shouldn’t be brainwashed by the profit; invest the amount that you know you can lose. In this case, I will like to tell you that you are the one to determine what to invest.
He said, he will open my bitcoin wallet and help to buy bitcoins. Should I invest in bitcoin?
Yes, it is a good idea to invest in bitcoin, but understand it before you invest in it.especially, be cautious about him that will open the wallet for you, and make sure you keep your seed phase (private key) very secure and not allow anyone to have access to your private key (seed phase), because if someone has access to those keys, it is like he has access to your bitcoin, and I hope you know what that means.