Where to find help understanding Bitcoin's source code in C++? I am looking to understand the Bitcoin C++ source code on GitHub. The Python one is simpler, but even that is too complicated for a beginner. Could someone guide me to some good resources on the actual implementation and its details? The actual C++ techniques used seem to be quite complicated.
I am not aware of an extensively commented version of the Bitcoin sourcecode, but you could check out the Bitcoin Developer Reference and you can read online the book Mastering Bitcoin by Andreas M. Antonopoulos, which covers Bitcoin's technical aspects extensively. There is also Princeton's Free Online Bitcoin course, which goes into details on some technical aspects, which might in turn help you understand the sourcecode better.

Besides that, try searching Bitcoin.SE for specific questions, there are a few here that have been asked about already, if you can't find something, feel free to ask a new question here.