This is the basic principle of investment, and if you give someone an idea about investment, never involve yourself in it. Ensuring your own safety is very important, someone will invest with excessive expectations from your words, but if they do not get the results as expected, they will blame you. And it is very natural to blame them like this. So if you want to explain investment to someone, you have to explain it in such a way that he himself takes a long-term investment decision. Just educate him about investment, if he is really interested in investing then common sense will be enough for him.
Your teaching and the words you pick to describe what Bitcoin is to someone will determine how they will react towards you if investment goes wrong or right, you can start by telling them how price of bitcoin can fluctuate and can’t be predicted they can’t get quick profit from it like they are assuming or see online, you give them the vital information and allow them to decide so that they can take sole responsibility for their decisions and not go hold you accountable for their lose or impatient.