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freeCodeCamp
Information Security
HelmetJS, penetration testing with Python. Free certification from freeCodeCamp.
Cyber Security Base
Course series on secure software and attacks.
Cybersecurity for Beginners
Basic cybersecurity concepts in short lessons.
Harvard CS50
CS50's Introduction to Cybersecurity
Secure your accounts, data, systems and software.
Coursera
Foundations of Cybersecurity
First course of the Google Cybersecurity certificate.
Coursera
Cryptography I
Stanford: how cryptographic systems work and how to use them correctly.