What is best depends on each person’s learning style, but I’ll give a suggestion.
- Read up on privacy/security/anonymity and threats to those as much as possible.
- Put privacy/security/anonymity measures you read about into practice in your own life.
For step 1, IIRC some starting points off the top of my head that I found useful for me, but may now be outdated, were
Privacy Guides is useful up-to-date resource for learning about tools and practices that can keep us safe. Keeping an eye on relevant news, civil liberties advocacy groups’ activities (privacy, digital rights, human rights, marginalized groups and so on) and community forums (this forum for instance) helps too.
Since we’re talking about learning, step 2 doesn’t say relevant, appropriate or sustainable, but obviously measures would need to be implementable, bearable and considerate of its own risks (social isolation and criminal prosecution for instance).
Putting measures into practices requires learning the details of how to use tools, how to implement them in your life, how effective they are and what limitations they have, and how to verify and test. This includes inspecting source code, tool documentation (manpages for CLI tools), debug logs, security audit reports, blog posts, community forums etc as needed.
Henry from Techlore said he adopted an extreme privacy/security/anonymity approach (privacy and security?) and then tamed it to something more sustainable and relevant to his threat model later on. That may be a good way to learn, not just about how to implement and maintain privacy/security/anonymity measures but also how effective and sustainable those measures are.
I basically did the same thing but discovered my threat model is higher risk than I had originally thought. Further, my threat model (everyone’s actually) worsened over time with techno-authoritarian surveillance and control spreading worldwide. Thus I didn’t need to tame it very far, and I was lucky to go as extreme as I did from the beginning.