Blenderole

If you ever need to place the 3d cursor over at an exact coordinate:

Quite usefull if you need to get the pivot point of an object somewhere.

Now it begins to get confused. There’s no way to move freely the pivont point (the pink dot) of an object, with a gizmo for example. You have to position first the 3d cursor to your liking then center the pivot to the 3d cursor. PLUS, sometimes the pivot is called “object’s origin”.
Extremely essential to [...]

From Blender3dClub:
Most use keys:
G - Grab/move selected items.
S - Scale selected items.
R - Rotate selected items.
X - Delet menu. Many options.
E - Extrude a vertex, edge or face.
B - Box selected items.
B - again..  ’Paint Brush’ select items.  Mouse wheel will adjust the size of the brush.
A - Select all (Deselect all).
K - Loop cut [...]

TAB: changes between edit mode and object mode. Obviously, object is for whole object, edit to edit the object.
CTRL+TAB: allows to change between vertex, edge or face edition mode.
Subsurface is here: