High-level computing

• Databases
• Message brokers
• Programming languages
• Security
• Linux
• MacOs
• Version Control
• Text Editors

Low-level computing

• Compilers
• Debuggers
• Computer architecture
• Embedded development
• Electronics

Even lower level computing

• Mathematics

Hardware & Machines

• Tools
• House Building
• Cameras
• e-readers
• cars

Etc.

• Notes on books
• Notes on writing
• Transcriptions
• Business