You can start by looking at https://kagi.com/stats?stat=leaderboard and adjusting domains that make sense to you. E.g. I have all Pinterest lowered, as well as w3schools.com as I prefer developer.mozilla.org (which I raised instead).
For bangs I’m pretty sure the default ones might be enough – just use them! Some of my go-to bangs are !gh, !gm for Google Maps (Kagi Maps are sometimes not as good in Asia), !yt, !mdn, and !amo for addons.mozilla.org.
So that if an NYT article comes up in the results I can get a version without paywall directly. You can set it up in https://kagi.com/settings?p=redirects.
I just stumbled across cooked.wiki recently. It allows you to convert any bullshit online recipe to a no-frills ingredient list and instructions. I've only tested it a couple times and I know I'll rarely remember to use the shortcut (https://cooked.wiki/<recipe-url>). But setting it up as a redirect rule from search results might be the thing that pushes usability over the top.
For bangs I’m pretty sure the default ones might be enough – just use them! Some of my go-to bangs are !gh, !gm for Google Maps (Kagi Maps are sometimes not as good in Asia), !yt, !mdn, and !amo for addons.mozilla.org.
I also have this redirect rule:
So that if an NYT article comes up in the results I can get a version without paywall directly. You can set it up in https://kagi.com/settings?p=redirects.