That is a good decision you have taken, if they invest in BTC of their own choice and understanding, there is a better chance they would not make a blooper and lose it, and you also would not be worried about losing your friendship with them if they are unsatisfied with the short term result of their investment. If you want your friend to even understand BTC much better, advise them to join the bitcointalk forum, this is where they will get the best information they need.
Investing in Bitcoin is more appropriate in the long term, although there are also those who do it in the short term, and in fact they are not called investors, they just want to double up, but this is not correct, so far most investors are more effective in using the long term. it's good when Op's friends join the forum to get at least a little stock of knowledge considering the forum is very broad to gain knowledge.