With interconnects, the MOST important thing is proper shielding. Unless you are running very long cables, most are ok. You dont need to spend more than a few bucks. I found this one to be the best for my cartridge to phono preamp, it works absolutely PERFECTLY:
https://www.amazon.com/gp/product/B016QVZF06/ref=ppx_yo_dt_b_search_asin_image?ie=UTF8&psc=1
Cant beat it for 9 bucks.
Shielding, keeping them short and away from higher current cables are the most important considerations for interconnects & low signal cables, especially the lower the signals become (like in MC cartridges).
For cables carrying more current, like power cords & speaker cables, the only requirement is that they are thicker (10 awg or less) and are pure copper. Silver may help a teeny teeny bit more but absolutely not worth the extra cost. You will never hear the difference and even a spectrum analyzer wont detect that much of a distinction. Plus, silver oxidizes/tarnishes very quickly where exposed to air and may create contact issues in time.
With digital cables, even the crappiest & cheapest ones WILL work perfectly , as long as they are within the correct category rating (cat5k up to 100 Mbits/sec, cat 6k & more up to about 1Gb/sec for up to 100 or so feet).
Dont fall for most of the bs about cables & connectors and especially fuses. Most of it is snake oil. People THINK they hear a difference, they DONT. They can not bring themselves to admit hearing no difference after having paid a $100 for a fuse.