What is the best way to do debugging for NET?

Question

.NET

Good evening,
I am writing a service for my own needs in C#. I chose it because of the developed APIs of many programs and the promising syntax, which, if you already learned it, allows you to work on many tasks. I like everything, there is an understanding, but I would like a simpler debugging. I especially liked the jupyter notebook at one time, which allowed me to make several hundred launches and quickly correct the code. I have not found such functionality in C# yet, only breakpoints, errors and warnings.
Please tell me, in your opinion, on the following issues:
1) The best way to visually and easily debug
2) Where can I read about the correct structure of OOP elements (as long as I create them according to the principle of statics for one entity, instances, respectively, interfaces are not needed at all, since I can’t realize their real need yet, but I don’t want to write artificially, and of course the modular structure to share the functionality)
3) I don’t use Tasks, because I started to deal with streams and spent time already, but I haven’t figured out how to take data back from the stream, forms works with Invoke, but there is no method for Invoke’s own classes 5) According to paragraph 2-4, it can is there literature for 100 pages maximum, so that in an understandable form they draw "for the brain" of the entire "elephant"? Thanks in advance.
4) In conjunction with item 3 - if you need to add functionality, where you can learn how to add the same Invoke, and how it works in C # adding functionality (it is clear that through the interface, but you need to work out its methods, and before that, understand how everything is different with related to another)