There are many great books, blogs, podcasts, and forums to learn about financial planning, investing, and planning for early retirement.
Here are some that I truly enjoy:
The Simple Path to Wealth, Jim Collins
How to Think About Money, Jonathan Clements
All About Asset Allocation, Richard A. Ferri
The Millionaire Next Door, Thomas J. Stanley, William D. Danko
The Lazy Person’s Guide to Investing, Paul B. Farrell