There are a few ways to select tools from AutoCAD one of those are to click on the icon on the Ribbon, another is by typing in the command. However to save time for some tools you only have to type in the first 2 letters and you can start using your tool. This helps save a lot of time as you don't have to type in the whole tool name, so this is a list of a few basic shortcuts, hope you enjoy :)
A - Arch
B - Block
C - Circle
CH - Object Properties
CO - Copy
DI - Distance measure
DIV - Divide object
DO - Donut
DT - Single line test
E - Erase
EX - Extend
F - Fillet
H - Hatch
L - Line
MA - Match Properties
MI - Mirror
OP - Options/Properties
PU - Purge
RE - Rectangle
RO - Rotate
S - Stretch
SC - Scale
TR - Trim
Z - Zoom
F3 - Snap on/off
F8 - Ortho on/off
A - Arch
B - Block
C - Circle
CH - Object Properties
CO - Copy
DI - Distance measure
DIV - Divide object
DO - Donut
DT - Single line test
E - Erase
EX - Extend
F - Fillet
H - Hatch
L - Line
MA - Match Properties
MI - Mirror
OP - Options/Properties
PU - Purge
RE - Rectangle
RO - Rotate
S - Stretch
SC - Scale
TR - Trim
Z - Zoom
F3 - Snap on/off
F8 - Ortho on/off