You can find some basic economics here: https://www.mruniversity.com
Or visit Khan acedemy. Good resource to start with.
Trading: I like youtube channel 212. It's good for a beginner.
Crypto: blockgeeks.com
They have a lot of guides amd they are easy and extensive.
Also check Investopedia if you don't understand any term. They are good at explaing things in very essy way.