As I am using the Coinbase Exchange I had also tried their Earn part (I laso remember there was an old Earn page which Coinbase acquired) of ecosystem which is dedicated to learning courses. If you are eligible you get free crypto after you pass final quiz which should be easy if you have paid an attention. They mainly focus on different projects not in overall curses, trading, blockchain etc.
If you would like to know deeply about blockhain and similar technologies you have to find different platform.