All the base knowledge you need is here: https://en.bitcoin.it

Learn about the network's rules and what transactions are and are not allowed. Once you have a strong understanding of the rules everything else will start to fall into place.

Don't worry about what is and isn't important, just what interests you. Learn to practice good personal security. Learn how to protect your seed phrase at all costs. Listen to yourself. If at any point you feel like the action you are about to do feels risky, stop doing that action and educate yourself on the risks.