Basic Security Guide | https://techsolidarity.org/resources/basic_security.htm
Basic security precautions for non-profits and journalists in the United States, mid-2017.
https://news.ycombinator.com/item?id=13622684
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Security First | https://advocacyassembly.org/en/partners/securityfirst/
making it easier for human rights defenders to work safely
https://news.ycombinator.com/item?id=14544031
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UCLA CS88S: Safety in the Cloud – Introduction to Cybersecurity | https://kfrankc.me/cs88s/
an preliminary introduction to the field of cybersecurity
https://news.ycombinator.com/item?id=14056893
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bonus (Windows): https://decentsecurity.com/