Audio Education

For some pointers on cables and various cable geometries (i.e. how they are constructed, take a look at this link...

http://image99.net/blog/files/category-cable-science-basics.html

It mainly deals with DIY cables but it also explains the benefits of different  cable materials, geometries/, connectors

If DIY is not your thing then I would take a look at Anticables products - they are very good and reasonably priced.

If you want excellent performers then take a look at KLE Innovations products - they really outdo most other cables - even their entry level cables outperform most others

The link is my site, so if you have any questions ask away.

Regards

The definitive book on loudspeaker and room interaction is this one by Floyd Toole, recently updated to a third edition. 

https://www.amazon.com/Sound-Reproduction-Psychoacoustics-Loudspeakers-Engineering/dp/113892136X/ref...

after education on audio and electronics, you will stop being audiophile.

My suggestion, and what's worked well for me, dig into DIY. I suggest starting with Nelson Pass. He makes things very understandable and his designs are easy to build. Mr. Carlson's Lab on YouTube is excellent material too. The scope of his channel goes way beyond audio, but he's very good at explaining things and he's started a Patreon where he's teaching electronics starting with the bareknuckle basics. Burning Amp lectures are good stuff too.