I've read through all the replies and although there were different responses, I think I have gotten the best answer to my question because most members gave similar answers.
I was not trying to convince my friend, I just educated him a bit on the difference between Bitcoin and altcoins. I don't convince people to invest in anything at all, not even Bitcoin.
From the replies, I think I would just help him understand Bitcoin better and leave the rest for him. If he wants to buy then fine, if he doesn't, still fine.
I would also keep reminding that the best way to learn more about bitcoin and the lingo would be checking binance academy. You should check that out too, not for yourself because if you have been here long enough then you know them all already, but you should check it for your future, to tell people. Knowing something and teaching it are different skills, I know how to write very well for example, I am very good at it in fact, but when it comes to teaching it to others? I would be fish out of water.
So if you check binance academy yourself as well, then you will know how to teach it to other people and if your friend reads it then they will learn a lot better from there than what you can tell them personally.