pager commands allow navigation through large text files or data streams.
GNU Boxes is one of a handful of great ASCII art utilities for linux released under the GPL.
Visual Studio Code is relatively lightweight, has many useful features, a FOSS version, its settings are stored in files, and extensions are easy to write.
Incredibly powerful feature, the ability to create filters and run secected text through any command line script or program.
Take notes about what you learn while developing or admining