I second the sharpen prompt, and the UX design course with Google. Or https://designercize.com/ will give you random prompts to work on. Source: almost 2 years ago

For basic topics you can look at CollectUI's subjects and pick some that interest you. For more advanced subjects I can recommend Designercize. Source: about 2 years ago

Actually just stumbled upon https://designercize.com/ myself today and did a few prompts with my boss. The randomness helped push me to think outside the box and find more reasonable (albeit absurd) solutions. Source: over 2 years ago

I need to practice my whiteboard challenge skills. Anyone wants to do this with me? We can get prompts from these places: https://designercize.com/ or https://sharpen.design/ and come up with things on zoom. Source: over 2 years ago

Designercize.com, if you look to solve whiteboarding challenges that might be happen as part of hiring interview process. Source: over 2 years ago

While I'm aware that there are current resources out there such as Mobbin or Pttrns, I have been taking my own screenshots for a while now and it would be great to be able to set up tags to categorise and organise these. Source: almost 3 years ago

Https://pttrns.com/ is a similar site but the quality went down a bit. Source: almost 3 years ago

Maybe try mobbin.design or https://pttrns.com/. Source: about 3 years ago