the website calls it "the largest firing operation in history" and asks people to submit full names, locations, employers, and pictures by email.
https://www.charliesmurderers.com/
from AlcoholEnjoyer: reminder to never ever look yourselves up on sites like these
unfortunately, i don't really have anything to recommend from an opsec perspective. most of what i know was learned from reading documentation when I was working as a web developer, and hosting a few personal servers occasionally. i doubt server/browser documentation is what you had in mind.
i'll say that if you're not really doing anything super spicy you probably don't have to worry too much about opsec. unless you're willing to cut out a lot of really convenient online services from your life you're just going to have to accept that the big tech companies are going to know more about you than you should be comfortable with. aside from them you just need to worry about hackers so: run an adblocker, use a password manager and unique passwords, keep your browser and OS up-to-date, and accept that no matter what you do some dipshit is going to fuck up securing their side of things and you're probably gonna be exposed in a data breach anyway.