What are some resources that helped you level up your User Experience skills?

I'll start with few that helped me. website - goodui.org - Their homepage itself has 40+ principles with examples that you can quickly learn and adapt Book - Refactoring UI by Steve Schoger , Adam Wathan was a great book IMO with clear and easy examples. Blog - https://52weeksofux.com/ - short 52 articles but will keep you occupied for an year.