You'd think setting up your content in Photoshop would be second nature; but oftentimes, the shortcuts to change the background size or zoom in to your project aren't what you think. 
Here are some of the most crucial shortcuts to know:

Draw Marquee from CenterAlt-Marquee
Add to a SelectionShift
Subtract from a SelectionAlt
Intersection with a SelectionShift-Alt
Make Copy of Selection w/Move toolAlt-Drag Selection
Make Copy of Selection when not in Move toolCtrl-Alt-Drag Selection
Move Selection (in 1-pixel Increments)Arrow Keys
Move Selection (in 10-pixel Increments)Shift-Arrow Keys
Select all Opaque Pixels on LayerCtrl-click on Layer Thumbnail (in Layers panel)
Restore Last SelectionCtrl-Shift-D
Feather SelectionShift-F6
Move Marquee while drawing selectionHold Space while drawing marquee
Fit on ScreenDouble-click on Hand tool or Ctrl-0
100% View Level (Actual Pixels)Double-Click on Zoom Tool or Ctrl-Alt-0
Zoom inCtrl-Space-Click or Ctrl-Plus(+)
Zoom outAlt-Space-Click or Ctrl-Minus(–)
Hide all tools and panelsTab
Hide all panels except Toolbox and Options barShift-Tab
Rotate through full screen modesF
Scroll image left or right in windowCtrl-Shift-Page Up/Down
Jump/Zoom to part of ImageCtrl-drag in Navigator panel
Toggles layer mask on/off as rubylith\
Layer Shortcuts
Create new layerCtrl-Shift-N
Select non-contiguous layersCtrl-Click layers
Select contiguous layersClick one layer, then Shift-Click another layer
Delete LayerDelete key (while in the Move tool)
View contents of layer maskAlt-Click layer mask icon
Temporarily turn off layer maskShift-Click layer mask icon
Clone layer as you move itAlt-Drag
Find/Select layer containing objectRight-Click on the object w/Move tool
Change layer opacityNumber pad keys (w/Move tool selected)
Cycle down or up through blend modesShift-Plus(+) or Minus(–)
Change to a specific blend mode(w/Move tool) Shift-Alt-letter (ie: N=Normal, M=Multiply. etc.)
Switch to layer below/above current layerAlt-[ or Alt-]
Type Shortcuts
Select all text on layerDouble-Click on T thumbnail in Layers panel
Increase/Decrease size of selected text by 2 ptsCtrl-Shift->/<
Increase/Decrease size of selected text by 10 ptsCtrl-Shift-Alt->/<
Increase/Decrease kerning/trackingAlt-Right/Left Arrow
Align text left/center/rightCtrl-Shift-L/C/R
Fill selection with background colorCtrl-Backspace
Fill selection with foreground colorAlt-Backspace
Fill selection with foreground color using Lock Transparent PixelsShift-Alt-Backspace
Fill selection with source state in History panelCtrl-Alt-Backspace
Display Fill dialog boxShift-Backspace
Sample as background colorAlt-Click w/Eyedropper tool
To get Move toolWhile in any painting/editing tool-hold Ctrl
To get Eyedropper with Paint toolsAlt
Change paint opacity (with Airbrush OFF)Number keys
Change paint opacity (with Airbrush ON)Shift-Number keys
Change Airbrush flow (with Airbrush ON)Number keys
Change Airbrush flow (with Airbrush OFF)Shift-Number keys
Cross-Hair CursorAny painting/editing tool-turn Caps Lock on
Decrease/Increase Brush Size[ or ]
Decrease/Increase Hardness of BrushShift-[ or Shift-]
Switch between preset Brushes< or >
Open Brushes pop-up panelRight-Click in Image window
Erase to History panel's source stateAlt-Eraser
Cycle down or up through blend modesShift-Plus(+) or Minus(–)
Change to a specific blend modeShift-Alt-letter (ie: N=Normal, M=Multiply, etc.)
Create fixed color target from within a dialog boxShift-Click in image window
Delete fixed color targetAlt-Click on target with Color Sampler tool
Create new spot-color channel from current selectionCtrl-Click on New Channel button in Channels panel
Pen Tool Shortcuts
To get Direct Selection tool while using PenCtrl
Switch between Add-Anchor and Delete-Anchor Point toolsAlt
Switch from Path Selection tool to Convert Point tool when pointer is over anchor pointCtrl-Alt
To Select a whole path w/Direct Selection toolAlt-click
Convert path to a selectionCtrl-click on path name (in Paths panel)
Panel Shortcuts
Show/Hide Brushes panelF5
Show/Hide Color panelF6
Show/Hide Layers panelF7
Show/Hide Info panelF8
Show/Hide Actions panelAlt-F9
Open Adobe BridgeCtrl-Alt-O
Other Shortcuts
Switch between open documentsCtrl-Tab
Undo or Redo operations beyond last oneCtrl-Alt-Z/Ctrl-Shift-Z
Apply Last FilterCtrl-F
Opens Last Filter Dialog BoxCtrl-Alt-F
Hand ToolSpacebar
Reset Dialog BoxHold Alt, Cancel turns into Reset Button, Click it
Increase/Decrease value (in any option field) by 1 unitUp/Down Arrow
Increase/Decrease value (in any option field) by 10 unitsShift-Up/Down Arrow
Replay last TransformationCtrl-Shift-T
Measure Angle between Lines (Protractor Function)After ruler is drawn, Alt-Drag end of line with Ruler Tool
Move Crop Marquee while creatingHold Space while drawing
Snap Guide to Ruler ticksHold Shift while dragging
Highlight Fields in Options bar (n/a for all tools)Enter
Don't Snap object edge while movingHold Control while dragging
MMarquee tools
LLasso tools
WQuick Selection, Magic Wand
CCrop and Slice Tools
IEyedropper, Color Sampler, Ruler, Note, Count
JSpot Healing Brush, Healing Brush, Patch, Red Eye
BBrush, Pencil, Color Replacement, Mixer Brush
SClone Stamp, Pattern Stamp
YHistory Brush, Art History Brush
EEraser tools
GGradient, Paint Bucket
ODodge, Burn, Sponge
PPen tools
TType tools
APath Selection, Direct Selection
URectangle, Rounded Rectangle, Ellipse, Polygon, Line, Custom Shape
K3D Tools
N3D Camera Tools
RRotate View
DDefault colors
XSwitch Foreground and Background colors
QQuick Mask Mode
To switch between all tools within groups, add the Shift key to the letters above
For example, to switch between rectangular and elliptical marquee hit Shift-M


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