But you must also be able to explain the risks of investing to your friends and must have a clear investment pattern and target, whether short term, medium-term or long term. In addition, if your friend intends to buy bitcoin, it's a good idea to understand this cryptocurrency first. So, no regrets after that.
That's what I was thinking too, OP has to also explain to his/her friend the risks involved in investing bitcoin because there's a possibility of being blamed for recommending bitcoin because the friend didn't know the risks involved. If I were to recommend bitcoin to a friend, I also have to ask them of their risk tolerance and if they can hodl for a really long time.