What are important principles that helped you develop a security mindset? How did you internalize them?

Some examples that have helped me are listed below:

A. CIA/AAA - helped paint the big picture, though it did not click for me until I could connect tools and processes to the letters in the acronyms.

Ex:
C = Encryption and Hardening
I = Authentication and Hashing
A = Resiliency and Recovery

Authentication = Identity Management
Authorization = Access Management
Accounting = Auditing, Inventory Management and Monitoring

Bonus: Authentication + Accounting = Non-repudiation

Side note: I had a very …

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