Amazon is always a good place, you can get Kindle books fairly cheap.
Then use Youtube/SO to widen your understanding
Buying a book and watching on youtube I think it will be some science to be missed, unlike a course in general will give all the knowledge he has.
Guys, please advice me currently interesting courses where i can study blockchain and investment in crypto and receive a certificate. What are the most interesting and authoritative?I want to become a certificated crypto expert.
I've seen some people offer online course services but unfortunately I forgot with their threads.
Well, if you still can not find a place that you think is good, the choice is udemy and coursera. It's up to you.