Welcome to PF!
Make sure you know about the three main sections in PF, and explore them well:
1. The main forums, that you see in the first page.
2. Insights Blog, available at the top row (header section). It contains articles that help in learning topics to a great extent.
3. The videos, also available in the header section. The media gallery now has some great videos in almost every aspect in science, and they provide an audio-visual learning experience.
With regards,
Wrichik.