best ways to find amazon coupon codes beyond the clip coupons?

amazon's coupon system is weird compared to most retailers. they have those little "clip coupon" checkboxes on product pages which is cool but the discounts are usually tiny like $2 off a $50 item.

i'm trying to figure out if there are better ways to find amazon coupons. like are there sitewide codes that exist? percentage off codes? or is it really just the item-specific clip coupons and that's it?

i order a lot of household stuff and random electronics from amazon so even small discounts would add up over time. but searching for "amazon coupon code" just brings up a million sketchy websites that all look like they're from 2008.

also does amazon ever do those promotional codes for categories? like "20% off home goods" or whatever? i feel like i've seen those before but can't remember where.

the other thing that's confusing is prime day deals vs regular deals vs lightning deals vs coupons. there's like 5 different discount systems happening at once and i never know which one is actually the best value.

anyone have a system for maximizing amazon discounts beyond just price tracking with camelcamelcamel? trying to be smarter about my spending there since i probably order something like 3 times a week.