Recent 1-pagers on Wall-Skills.com:
Is the vision for your product rather fuzzy? Design the box is an awesome technique to bring clarity and focus.
If you’re in a Scrum environment you’ll might encounter Lean at one point. Here’s a vocab cheat sheet: Japanese Terms in Lean
User Stories in a nutshell 1 page
Does your job entail keeping an eye on log files? Try less +F for viewing logs