I know it's good to diversify, but I'm used to using only one market, which has been down quite frequently here recently. I read that you can use mirror links to order, but I'm skeptical. Not interested in losing money to a fake link or whatnot. Is it just the business of finding a trusted mirror link (like from dnstats)? Or is it a completely bad idea? (Any explanation of how mirror links work would also be of great help)
What are you even asking.
Simply mirrors found either on the superlist or dnstats are made by the owner of the site. Usually in the computer world a mirror is a malicious site, on the DNMs it's used interchangeably with the word alternate.
Technically these are just alternate links to the site. Also technically all of the links could be considered alternate (there's no difference from a "main" link and a "mirror" link)