Howdy Jamie453,
Thanks for your feedback! Finding C++ Tutorials and Documentation pages can be a little tricky when using the Navigation Menu. Our C++ pages can be a little bit spread out. The easiest way to locate anything regarding a certain topic would be the search bar on our main Documentation Home Page.
API Documentation Pages, while being extremely helpful, can be confusing for users who are unfamiliar with C++ and/or UE4. I would use our Programming Guide, which can be found in our Navigation Bar. There are numerous Quick Starts and Tutorials for C++. You can also try our YouTube channel where we have step by step tutorials on using C++ in UE4.
As for new Videos/Pages, we have numerous requests in our database to address using C++ in UE4. I can not say when these will be tackled, but we are always working on getting out new content for requests every week.
Regarding Creating UI Elements, this YouTube Tutorial series should help out with any questions that you may have: User Interface With UMG | Unreal Engine Documentation
Please let me know if you have any additional questions.
Thanks again and have a great day!
-Sean G