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There is a huge amount of keyboard shortcuts in Photoshop and it's Impossible to remember them all by heart, so I made a list here of the ones that I use the most.
Notes:
I'll be using ‘+’ - to define two or more keyboard combinations. For example, CTRL + ALT + DEL etc.
If you are using Macintosh, CONTROL = COMMAND and ALT = OPTION
Photoshop Keyboard Shortcuts:
1. CTRL + C = Copy
2. CTRL + V = Paste
3. CTRL + C + SHIFT = Copy Merged
4. Press X to switch foreground/background color
5. Press D to reset foreground/background color to black/white
6. Press ALT + DELETE to fill the layer with foreground color or SHIFT + DELETE to fill with background color
7. CTRL + Z = Undo/redo previous activity
8. CTRL + ALT + Z = Undo multiple times
9. When working with big files it's very important to save often (5-10 minutes). Press CTRL + S to save
10. CTRL + + = Zoom in
11. CTRL + - = Zoom out
12. ALT + SCROLL WHEEL UP/ALT + SCROLL WHEEL DOWN = Zoom in/ zoom out
13. CTRL + SPACE + CLICK = Quick zoom in
14. ALT + SPACE + CLICK = Quick zoom out
15. CTRL + W = Close current document
16. CTRL + 0 = Set image to fit window
17. F7 = Show/hide layer pallete
18. CTRL + E = Merge selected layers
19. CTRL + SHIFT + E = Merge all visible layers into one
20. CTRL + D = Deselect.
More shortcuts to come in a short wait... get it.. SHORT wait.. never mind.