On a PC - Press ESC - Keybind and all the keys will be shown and more, and you can re-assign them.

I tend to use Q and E for spells keys and change A and E to strafe rather than turn, I use Z for a common but not critical spell assignment (in my case , Cleric Stance toggle).
The other important key is SHIFT - F for Focus Target, which will keep a box open of the target (friendly or enemy) open so as to make it easy to see and select in a big fight.
I also changed my hot bar 2 from using CTRL + 1 -> = to SHIFT 1 + 1 -> = , easier for me to hit SHIFT + something rather than CTRL + something.

The other stuff is in the Main Menu bar, the one with all the buttons... some have shortcuts like J - Journal, C - Character, I - inventory , Shift I - Armoury, N - Crafting , H - Hunting Log...ect.