1. First and foremost, do not believe right away on the topics you read on this forum, some news misleads newbies to manipulate them. This one is very important. Read different posts and articles and compare it. The most same answer is correct.
2. Be sure to invest on the amount you are willing to lose for. If you are a beginner , you are prone to lose, and if you lose from the start, you will also lose hope and interest on what you are investing for.
3. Have a stable mindset always. This can lead you to be more patient and have a good decision after. Mind over body. This should possess all of us, not only newbies.
These three are main information we should know. Hope it would help.