Guide to proper anonymous accounts

Would be great to compile a list/ guide of things like buying a pc second hand you pay for in cash that you never log onto with your accounts for setting up accounts, making it harder to find the owner of accounts, setting up a sequence of accounts where you filter your crypto thru again another step to make the bread crumbs less. VPNs that you can get and pay for without any trail leading to you.
Email accounts that you use and recommend to others to keep your privacy.
Specially interested in a list of common mistakes that people make when they think they are anonymous, chain is only as strong as it’s weakest link so think this could help quite a few people and lets us help the community.
Cheers eidan