Yes, I'm very new to btc but I'll give feedback and if I get some free time I'd also like to study the source code. I'm sure it would be great to learn about how btc works. I mean, how a program can communicate over the btc network

I use the @Bitcoin Dev Kit library which abstracts all details of the signatures and so on. And currently @Bitcoin Dev Kit communicates to electrum servers, which then in turn communicate with a Bitcoin full node.