Oh, there are too many short keys and functions, there is no need for reading the whole PDF, just mouse over at the ones that you use more often inside blender and try to remember the short key to that.
It is a good thing to ask, there are some habits that can speed up a lot our work! The ones that really makes a difference for me are:
Ctrl + Tab in edit mode: Allow you to change the selection mode to vertex, face or edge (if you press Ctrl + tab and then press F you are going to change the selection mode to face, for example;
Tab: Change the object interaction mode to the last one used (to fast change between edit and object);
Z: wire frame mode;
Numpad numbers to lock to the specific view;
G: translate;
S: Scale;
R: Rotate;
Axis constraining while transforming:
X: constrain the transformation to the world X axis;
Z: constrain the transformation to the world Z axis;
Y: constrain the transformation to the world Y axis;
Shift + X : constrain the transformation to the world Y and Z axis;
Shift + Z : constrain the transformation to the world X and Y axis;
Shift + Y : constrain the transformation to the world X and Z axis;
And if you press any of those twice, it will constrain the transformation to the local axis instead, which is very powerful
Besides the space bar, those shortcuts are the ones that really makes a difference for me.
Other than that it is just like @thoth444 said, eventually you are going to develop your own routine