How to Learn Security Fundamentals Roadmap
Check this out: https://www.hoppersroppers.org/library/thingsWorthDoing.html
Learn security theory and execute defensive measures so that you are better prepared against threats online and in the physical world.
Learning Objectives: Security Theory, Practical Application, Real-World Examples
For a start, complete this course: https://academy.hoppersroppers.org/course/view.php?id=9
From there, keep going through things worth doing.