I don't have the knowledge to Poke around that source
One of the best ways to learn is to study what others more knowledgeable do.
Learn from the Masters, so to say.
Trying to access Google drive IMO is not something a C++ beginner is going to find easy. Dealing with network sockets and a complex API is not all that simple. There might be other aspects of the task I haven't thought of.
I don't know what your level of experience with C++ is, so.....
The lessons at Learn C++ might be a better fit for a beginner:
Gain some solid bedrock foundation of C++ knowledge first and then build on that. Learn C++ won't show you every possible part of the C++ stdlib, it will expose you to a good chunk with examples you can play around with.
I'm a self-taught programming hobbyist, been trying to stuff C++ into my brain since before C++98 was a standard. When I started there were no online (and free) resources like there are now. Buying books was it.
No vast number of git repositories for 3rd party libraries either.