This forum will be the first medium to know about bitcoin wherein your friend can interact on do's and don'ts regarding about bitcoin. Youtube is also the best for it hence it has more videos about it and you can also explain to him directly that will certainly make him more interested about bitcoin.
But unfortunately only a handful of people know about this forum, even if I wasn't introduced to this forum by a friend a few years ago, maybe I wouldn't have known about this forum and maybe never even knew that there was a forum that specifically discussed this kind of thing.
As for YouTube, it might be a pretty good reference because there are a lot of content creators currently discussing crypto, especially bitcoin.
besides that they can also understand more because they don't only focus on reading because there are so many people who are lazy to read but on media platforms like YouTube they are more visualized through direct examples as well as sound and video