Initially you have to explain bitcoin first and the risks of trading.
By teaching the basics of cryptocurrency, at least your friends know the risks and profits here.
if he asks what coin to buy I think the best answer is bitcoin.
It is not easy to understand cryptocurrencies that have been running for years, if you are new to cryptocurrency, y
ou must have basic knowledge about analysis at least, because many have gone bankrupt here too.
Also let him learn analysis, without you needing to explain one by one the coins that are on coinmarketcap because there are so many,
and giving him a telegram channel about trading education is likely to help you teach your friends.