You should define the tools, not the other way around.
In the order of solid → abstract tools
- Calendars for events
- Timers for time-tracking and breaks
- Checklists for the dumb things
- To-do Lists for todo-items
- Note-taking for (Article) Evergreen notes
- The original Slip-box (Zettlekasten) system is from here
- Spreadsheets for data
- File System or filing system for storing and accessing data
- Large Language Model for automating busywork
- Paper for Thinking
- & Digital scratchpads are useful too (BBEdit, Mathematica, etc.)