Answer:
There are 4 SECTORS!
Step-by-step explanation:
Alphabetical (Word keys, main function keys), Numeric (Number keys. which is the number pad to your right), The function keys (Like Num. lock, and the F keys that go through F1 to F12), and the Cursor keys (Which is LITERALLY just the arrow keys) But if you were a gamer like me, you'd know that WASD is better for gamers.
Another mention: Control Keys ( Includes your Windows Icon, Left Ctrl, Alt, Fn(If it's there) Your Tab key, your Caps, Shift, and Right Ctrl.)