Most books people recommend will be pop-business books. They are easy to read, filled with business stories and make you feel like you're learning something. Avoid these books.

If you are serious about learning, use textbooks. They are designed for conveying knowledge.

1. Start will high school level then move your way to university economics 101.
2. Initially cover the broad spectrum around economic (micro, macro, behavioral, game theory, etc)
3. Find what interests you and read deeper in that direction and be sure to apply it !