As much as they annoy me, I think MS doesn't get enough credit for their dev docs. MDN has some more expository docs in addition to their great reference pages, too. They're super useful, but having them combined can be a real struggle for folks that have difficulty harnessing their attention.
Given the context of conversation, just noting that I too have ADHD and writing in C# has been definitely more doable than dynamically typed languages (or languages that require a lot of code to express something LINQ allows me to do in 1 or 2 lines, like Go). And as long as you know the type for the feature you need, you can usually just write e.g. "Regex" and press `.` and the VS Code or any other IDE of your choice will show you the list of supported methods - most of them are really straightforward to use. It works really well and knowing I don't have to perform much of work to ensure what amounts to type safety manually, or write additional tests, has been really helpful.
More on C# Regex, extra props for source-generated Regexes also generating documentation to explain the exact pattern and how it is matched similar to how websites like regexr do it.