Keyboard Shortcut Trainer
Drill the keyboard shortcuts of the tools you live in. Pick one of 13 profiles, Vim fundamentals to Generic OS shortcuts; read the task, type the key sequence (space-separated, e.g. d w or Ctrl+B), and get graded correct, partial, or incorrect.
Testing a keyboard rather than drilling it? The Keyboard Tester draws your own board and tracks which keys have not registered. The Markdown Editor is a real writing surface with a live preview, where the Generic OS deck's select, cut and undo chords do what the deck says they do. For the shell decks, Pipeline Factory assembles the kind of command line the Bash readline drills are teaching you to edit.
About this lab4 paragraphs
Every task and result is plain text; no visual keyboard required.
Grading normalises what you type, so Ctrl+B, ctrl-b and C-b are the same chord and spacing between chords does not matter. It will not accept a different key that happens to reach the same place. Each task asks for one sequence.
The decks are recall drills, not documentation. They cover the motions worth having in muscle memory rather than every binding a program defines, and a profile you already know will run out of new material quickly.
The trainer was once also reachable under /toys/. That address is gone, because every page here has one address, so an old link to it will not work.