Reading a shortcut list doesn't put it in your fingers. This shows a task — “insert today's date” — and waits for you to press the actual keys. Misses come back more often until they stick.
Nothing saved yetYour inputs are kept in this browser only — nothing is sent anywhere.
Press the combination while the trainer box is focused. The browser will block a few combinations (Ctrl+W, Ctrl+N, Ctrl+T) — those are excluded. On Mac, ⌘ is used where Excel for Mac uses it.