Here are some videos and blog posts that I found worth sharing:
- Full React Course 2020 - Learn Fundamentals, Hooks, Context API, React Router, Custom Hooks: 10 hour free video
- 30 Days of React: a free challege for both beginners and advanced React developers
- Full-Bleed Layout Using CSS Grid: an elegant solution to a tricky modern layout
- Sublime introductory lectures: great introductory university lectures for different topics
- Complete Guide to Open Source: ~40 min video about why and how to get involved with open source