One thing I would like to add is that every investor should know at least something about both technical analysis and fundamental analysis. Otherwise you will constantly make bad decisions, both in the long term and the short term. It is not always easy to know when the dip has reached it's bottom or whether it is a bull trap of a longer downtrend.

If you don't have a clue about fundamentals, you will easily buy into coins with no potential whatsoever. Just because somebody else try to tell you it's great.