Buying at an appropriate amount is fine. Maybe just using some spare cash that you have won't be harmful actually. Most important is to learn about the game and be good at it. Buying is also not the only option be get it because you can earn it from many other methods.

There are a lot of free courses and videos from youtube that people share their knowledge on bitcoin. It is not really necessary to join courses that charge unless they are really good.

Those coins are trying to mimic and confuse many people. But it is difficult to ignore them because their gains are crazy!