The best Unity learning resources are at the source; video tutorials, articles, free assets, and documentation are all available from https://unity3d.com. However, if you're looking for community answers or a specific solution to a programming problem, give the following sites a visit:
- Unity Learn: https://learn.unity.com
- Unity Answers: https://answers.unity.com
- Stack Overflow: https://stackoverflow.com
- Unify Community wiki: http://wiki.unity3d.com/index.php
- Unity Gems: http://unitygems.com
There is also a huge video tutorial community on YouTube if that's more your speed; here are my top five:
- Brackeys: https://www.youtube.com/user/Brackeys
- quill18creates: https://www.youtube.com/user/quill18creates
- Sykoo: https://www.youtube.com/user/SykooTV/videos
- Renaissance Coders: https://www.youtube.com/channel/UCkUIs-k38aDaImZq2Fgsyjw
- BurgZerg Arcade: https://www.youtube.com/user/BurgZergArcade
The Packt library...