The common mistake that beginners make is to follow investment advice from people they don't even know that they read on social media or on bitcoin
Well, that is a big mistake, not a common mistake.
As a beginner in trading, you should have your own research so that you can obtain knowledge and skills on how to have a good strategy in trading. Never start in trading if you are not ready, sounds like cheating if you will listen to others advice, following pump and dump groups. You will never grow up if that is how you will start trading. However, you will consider also that the experience is the best teacher in trading.