Before wanting to know important things about Bitcoin and crypto, it is very important to know your goal in learning important things about Bitcoin and crypto.
The purpose, how it works and the benefits contained in Bitcoin that you need to know. After knowing this, move on to the purpose, how it works and the benefits found in crypto.

The way to do this is to prepare time to read everything related to what you want. Then examine it with reality.
All available if internet is still available.