For awhile now, I've been aware of the Electronic Frontier Foundation (the EFF), and I make good use of a fair number of their projects. The following is not an exhaustive list:

I also follow a fair share of recommendations from Privacy Tools (https://privacytools.io) including using uMatrix and CookieAutoDelete.

Now I recently came across another of their projects that I will most likely end up pointing people from now on. That project is Security Self-Defense, and they have a plethora of how-to guides explaining how to protect personal data and delete personal data. There's also a ton of information on steps you can take to protect against hackers. One of my favorite articles outlines precautions to keep in mind at U.S. border crossings.

Check it out: Security Self-Defense from the EFF. (https://ssd.eff.org)