Electronic Frontier Foundation offers tips, tools and how-tos for safer online communications.
EFF
Official website ssd.eff.org
Our take
Not a piece of software so much as the Electronic Frontier Foundation’s library of guides, tools, and how-tos, and it earns its place by being a trustworthy starting point rather than a product. The limitation is exactly that: it teaches and points, it does not encrypt your files or block your trackers itself. Bookmark it as the place to learn what to do and which tools to trust; come for the education, then go install the actual tools.
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