The pointer picks the editor.
Shortcuts go to whatever is under the mouse, not the panel you clicked last. If a key does nothing, move the pointer over the viewport and try again.
The only design bible you will need to master Blender 3D. Every shortcut that gets a beginner unstuck, on one keyboard you can press.
Tap a key, or type on your own keyboard.
The screen shows what that key does in Blender. Latch shift, ctrl or alt to see the second layer, and flip the mode switch to see how keys change in Edit Mode.
Swipe the keyboard sideways for the numpad and mouse. Coloured squares show each key's job in the current mode.
Shortcuts go to whatever is under the mouse, not the panel you clicked last. If a key does nothing, move the pointer over the viewport and try again.
G, X, 2, Enter moves the selection 2 m along X. R 90 turns it 90°. S 0.5 halves its size. No dragging needed.
Forgot a shortcut? Press F3, type what you want, and the result shows its shortcut beside it. On a Mac laptop, press fn F3.
Learn the keys in the order you will need them. Day 1 keeps you from getting lost, week 1 lets you build, month 1 makes you quick. Tick a shortcut once your fingers know it. Progress stays in this browser.
Sixteen things that go wrong in the first month, and the keys that put them right. Pick the pad that looks like your screen, or describe the problem.
Blender assumes a three-button mouse and a numeric keypad. On a laptop, these settings and gestures fill the gap.
All under Edit › Preferences.