On my side of things I want to teach my friends everything that I know in the crypto industry especially on Bitcoin but when it comes to the question with regards to buying or selling I ultimately avoid answering it and explain to them that this kind of decisions are supposed to be made by you.
Honestly, it is a good approach to prevent any disappointments regarding the investment decision-making process. As some of our personal recommendations could be wrong and the outcome may contradict their expectation. Thus, it is better to suggest the evaluation of the market themselves to help them realize what actions they should do. In that manner, they will learn to weigh the possible risk associated with their investment. Personally, when my friends ask me about bitcoins' price and functional capabilities, I informed them of the basics and propose to do the rest of the exploration.