SWIM's recommendation for anyone wanting to learn is to sign up for Breachforum and read up on all of the contents in their OSINT subforum [1] where you can ask questions too. If you're willing to boogey on into the grey area, you can even download leaked datasets from BreachForum, Leakbase.io, etc. to make your job a lot easier if it involves identifying people online - for example a few databases like AT&T customer…
https://www.justice.gov/opa/pr/justice-department-announces-...