Below is a group of mac command keys that are useful. (H/T Adobe)

  • Start Help
Help key
  • Undo or Redo
F1
  • Cut
F2
  • Copy
F3
  • Paste
F4
  • ShoworHide Brush panel
F5
  • ShoworHide Colorpanel
F6
  • ShoworHide Layers panel
F7
  • ShoworHide Info panel
F8
  • Show or Hide Actions panel
Option + F9
  • Revert
F12
  • Fill
Shift + F5
  • Feather Selection
Shift + F6
  • Inverse Selection
Shift + F7
  • Move tool
V
  • Rectangular Marquee
  • Elliptical
    Marquee
M
  • Lasso tool
  • Polygonal Lasso
  • Magnetic
    Lasso
L
  • Magic Wand
  • Quick Selection
W
  • Crop tool
  • Slice tool
  • Slice Select
    tool
C
  • Eye dropper
  • Color
    Sampler
  • Ruler
  • Note
  • Count
I
  • Spot Healing Brush
  • Healing Brush
  • Patch
  • Red Eye
J
  • Brush
  • Pencil
  • Color
    Replacement
  • Mixer Brush
B
  • Clone Stamp
  • Pattern Stamp
S
  • Hist or y Brush
  • Art Hist or y Brush
Y
  • Eraser tool
  • Background
    Eraser tool
  • Magic Eraser tool
E
  • Gradient tool
  • Paint Bucket tool
G
  • Dodge tool
  • Burn tool
  • Sponge
    tool
O
  • Pen tool
  • Freefor m Pen tool
P
  • Horizontal Type tool
  • Vertical Type
    tool
  • Horizontal Type mask tool
  • Vertical Type mask tool
T
  • Path Selection tool
  • Direct Selection
    tool
A
  • Rectangle tool
  • Rounded Rectangle tool
  • Ellipse
    tool
  • Polygon tool
  • Line tool
  • Custom Shape tool
U
  • Hand tool
H
  • Rotate View tool
R
  • Zoom tool
Z
  • Cycle through open documents
Control + Tab
  • Switch to previous document
Shift + Command + `
  • Close a file in Photoshop and open Bridge
Shift-Command-W
  • Toggle between Standard mode and Quick Mask
    mode
Q
  • Toggle (Forward) between Standard screen mode,
    Full screen mode with menu bar, and Full screen mode
F
  • Toggle (backward) between Standard screen
    mode, Full screen mode with menu bar, and Full screen mode
Shift + F
  • Toggle canvas Color forward
Space + F
  • Toggle canvas Color backward
Space + Shift + F
  • Fit image in window
Double-click Hand tool
  • Magnify 100%
Double-click Zoom toolor

Command
+ 1

  • Switch to Hand tool (when not in text-edit mode)
Spacebar
  • Simultaneously pan multiple documents simultaneously
    with Hand tool
Shift drag
  • Switch to Zoom In tool
Command + spacebar
  • Switch to Zoom Out tool
Option + spacebar
  • Move Zoom marquee and dragging with the
    Zoom tool
Spacebar drag
  • Apply zoom percentage, and keep zoom percentage
    box active
Shift + Return in Navigat orpanel zoom percentage
box
  • Zoom in on specified area of an image
Command drag over preview in Navigate or panel
  • Temp or arily zoom into an image
Hold down H and then click in the image and
hold down the mouse button
  • Scroll image with Hand tool
Spacebar drag, or drag view area box in Navigat or
panel
  • Scroll upordown 1 screen
Page UporPage Down
  • Scroll upordown 10 units
Shift + Page UporPage Down
  • Move view to upper-left cornerorlower right
    corner
HomeorEnd
  • Toggle layer mask on or off as rubylith (layer mask
    must be selected)
\
  • Reposition marquee and selecting
Any marquee tool+ spacebar drag
  • Add to a selection
Any selection tool + Shift drag
  • Subtract from a selection
Any selection tool + Option drag
  • Intersect a selection
Any selection tool
+ Shift-Option drag
  • Constrain marquee to squareorcircle (if
    no other selections are active)
Shift drag
  • Draw marquee from center (if no other selections
    are active)
Option drag
  • Constrain shape and draw marquee from center
Shift + Option drag
  • Switch to Move tool
Command
  • Switch from Magnetic Lasso tool to Lasso tool
Option drag
  • Switch from Magnetic Lasso tool to polygonal
    Lasso tool
Option-click
  • Apply or cancel an operation of the Magnetic Lasso
Return or EscorCommand + .
  • Move copy of selection
Move tool + Option drag selection
  • Move selection area 1 pixel
Any selection + Right Arrow, Left Arrow,
Up Arrow, or Down Arrow
  • Move selection 1 pixel
Move tool + Right Arrow, Left Arrow, Up Arrow,
orDown Arrow
  • Move layer 1 pixel when nothing selected on
    layer
Command + Right Arrow, Left Arrow, Up Arrow,
orDown Arrow
  • Increase or decrease detection width
Magnetic Lasso tool + [or]
  • Accept croppingorexit cropping
Crop tool + ReturnorEsc
  • Toggle crop shield off and on
or (Forward slash)
  • Make protract or
Ruler tool + Option drag end point
  • Snap guide to ruler ticks (except when View >
    Snap is unchecked)
Shift drag guide
  • Convert between Horizontal and vertical guide
Option drag guide
  • Transfor m from centerorreflect
Option
  • Constrain
Shift
  • Distort
Command
  • Apply
Return
  • Cancel
Command + . (period)orEsc
  • Free transfor m with duplicate data
Command + Option + T
  • Transfor m again with duplicate data
Command + Shift + Option + T
  • Select multiple anch orpoints
Direct selection tool + Shift-click
  • Select entire path
Direct selection tool + Option-click
  • Duplicate a path
Tool+ Command + Option drag
  • Switch from Path Selection
Command
  • Switch from Pen tool or Freeform Pen tool
Option
  • Close path
Magnetic Pen tool-double-click
  • Close path with straight-line segment
Magnetic Pen tool + Option-double-click
  • Select for eground Colorfrom Colorpicker
Any painting tool + Control + Option + Command
and drag
  • Select for eground Colorfrom image with Eye dropper
    tool
Any painting tool + Optionorany shape tool
+ Option
  • Select background Color
Eye dropper tool + Option-click
  • Color sampler tool
Eye dropper tool + Shift
  • Deletes Color sampler
Color sampler tool + Option-click
  • Sets opacity, tolerance, strength, or exposure
    forpainting mode
Any editing tool + number keys
  • Sets flow forpainting mode
Any editing tool + Shift + number
keys
  • Mixer Brush changes Mix setting
Option + Shift + number
  • Mixer Brush changes Wet setting
Number key
  • Mixer Brush changes Wet and Mix to zero
00
  • Cycle through blending modes
Shift + + or –
  • Open Fill dialog box on backgroundorstandard
    layer
Delete or Shift + Delete
  • Fill with for egroundorbackground Color
Option + Delete or Command + Delete
  • Fill from hist or y
Command + Option + Delete
  • Displays Fill dialog box
Shift + Delete
  • Lock transparent pixels on or off
or /
  • Connects points with a straight line
Any painting tool + Shift-click
  • Cycle through blending modes
Shift + + or –
  • N or mal
Shift + Option + N
  • Dissolve
Shift + Option + I
  • Behind (Brush tool only)
Shift + Option + Q
  • Clear (Brush tool only)
Shift + Option + R
  • Darken
Shift + Option + K
  • Multiply
Shift + Option + M
  • ColorBurn
Shift + Option + B
  • Linear Burn
Shift + Option + A
  • Lighten
Shift + Option + G
  • Screen
Shift + Option + S
  • ColorDodge
Shift + Option + D
  • Linear Dodge
Shift + Option + W
  • Overlay
Shift + Option + O
  • Soft Light
Shift + Option + F
  • Hard Light
Shift + Option + H
  • Vivid Light
Shift + Option + V
  • Linear Light
Shift + Option + J
  • Pin Light
Shift + Option + Z
  • Hard Mix
Shift + Option + L
  • Difference
Shift + Option + E
  • Exclusion
Shift + Option + X
  • Hue
Shift + Option + U
  • Saturation
Shift + Option + T
  • Color
Shift + Option + C
  • Luminosity
Shift + Option + Y
  • Desaturate
Sponge tool + Shift + Option + D
  • Saturate
Sponge tool + Shift + Option + S
  • Dodge or burn shadows
Dodge tool or Burn tool + Shift + Option +
S
  • Dodge or burn midtones
Dodge tool or Burn tool + Shift + Option +
M
  • Dodge or burn highlights
Dodge tool or Burn tool + Shift + Option +
H
  • Set blending mode to Threshold for bitmap images
Shift + Option + N
  • Align left, center, or Right
Horizontal Type tool + Command + Shift +
L, C, or R
  • Align top, center, or bottom
Vertical Type tool + Command + Shift + L,
C, or R
  • Choose 100% Horizontal scale
Command + Shift + X
  • Choose 100% vertical scale
Command + Shift + Option + X
  • Choose Auto leading
Command + Shift + Option + A
  • Choose 0 fortracking
Command + Control + Shift + Q
  • Justify paragraph, left aligns last line
Command + Shift + J
  • Justify paragraph, justifies all
Command + Shift + F
  • Toggle paragraph hyphenation on or off
Command + Control + Shift + Option + H
  • Toggle single or every-line composer on or off
Command + Shift + Option + T
  • Decrease or increase type size of selected text
Command + Shift + <or >
  • Decrease or increase leading
Option + Down Arrow or Up Arrow
  • Decrease or increase baseline shift
Shift + Option + Down Arrow or Up Arrow
  • Decreaseorincrease kerning or tracking
Option + Left Arrow or Right Arrow
  • Start playing the timelineorAnimation panel
Spacebar
  • Switch between timecode and frame numbers
Option + click the current-time display
in the upper-left corner of the timeline.
  • Expand and collapse list of layers
Option + click on list triangles
  • Jump to the next or previous whole second in timeline
Hold down the Shift key when clicking the Next or Previous
Frame
  • Increase playback speed
Hold down the Shift key and dragging the current
time.
  • Decrease playback speed
Hold down the Command key and dragging
the current time.
  • Snap an object to the nearest object
Shift drag
  • Scale a selected group
Option drag
  • Back one frame
Left Arrow or Page Up
  • Forward one frame
Right Arrow or Page Down
  • Back ten frames
Shift + Left Arrow or Shift Page Up
  • Forward ten frames
Shift + Right Arrow or Shift + Page Down
  • Move to the beginning of the timeline
Home
  • Move to the end of the timeline
End
  • Move to the beginning of the w or k area
Shift + Home
  • Move to the end of the w or k area
Shift + End
  • Move to In point of the current layer
Up Arrow
  • Move to the Out point of the current layer
Down Arrow
  • Back 1 second
Shift + Up Arrow
  • Forward 1 second
Shift + Down Arrow
  • Delete brush
Option-click brush
  • Rename brush
Double-click brush
  • Change brush size
Ctrl + Option + drag leftorright
  • Decrease or increase brush softness or hardness
Ctrl + Option + drag upordown
  • Select previous or next brush size
, or .
  • Select first or last brush
Shift + , or .
  • Display precise cross hair forbrushes
Caps Lock
  • Toggle airbrush option
Shift + Option + P
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