My friend ask me, what coin he should buy , but I not really sure for now because I'm entering cryptocurrency 3 years ago. Too many coin right now that make me confusing
You don't have to explain all the coins you've come across over the past 3 years.
The most important thing is that your friends must know that trading here is a high risk.
If he accepts, start from the most basic like bitcoin and ethereum for easy understanding.
If he asks you what to buy now, at least give him an understanding based on a valid chart
I'm sure it will help your friend to understand the analysis of a coin.