About bitcoin mining you can't mine bitcoin with building mining rigs(CPU) or GPU because I think all pools now disable to support GPU and CPU mining.
If you heard about bitcoin mining it is not actually mining a bitcoin instead they are mining altcoin that can mine with CPU and GPU rigs and convert into bitcoin or they are using nicehash software that automatically convert your mined coins into bitcoin.

I think this thread https://bitcointalk.org/index.php?topic=1629118.0
might help newbies in some ways.