UX Challenges - Done reading about UX? Start doing it.
Indie Hackers - Connect with fellow entrepreneurs, developers, and bootstrappers who are sharing the strategies and revenue numbers behind their companies.
Befront - Learn UX/UI design skills in practice with bite-sized tasks
Geneva - An all-in-one communication app for groups & communities
Frontend Mentor - Supercharge your front-end skills by building in a real-life workflow. Solve real-world HTML, CSS and JavaScript challenges whilst working to professional quality designs.
Figma Community - Publish live design files for others to learn from & remix.