BASICS – a must know...   TOOLBAR       note that most of the buttons on the tool bar contains more than one tool or different modes just point your cursor to any of the button and right click to change.  
    LAYER PANEL     Set Blending Mode to blend photos together with various modes such as: Normal, Dissolve, Darken, Multiply, Color Burn, Linear Burn, Darker Color, Lighten, Screen, Color Dodge, Linear Dodge (Add), Lighter Color, Overlay, Soft Light, Hard Light, Vivid Light, Linear Light, Pin Light, Hard Mix, Difference, Exclusion, Subtract, Divide, Hue, Saturation, Color, Luminosity   Set Layer Opacity to adjust the layers' transparency from a range of 0-100%   Create New Layer   Create New Group a group to place all the layers inside, example: you could either drag a layer inside, or; create the group then click 'create new layer'   Create New Fill or Adjustment Layer   Add Layer Mask   Add Layer Style   Link Layers           +addmore   FILE FORMATS     PHOTOSHOP (*.PSD; *.PDD) – photoshop document most important file formats. it serves as a working file. all layers, layer masks, adjustment layers will be saved as a part of the file. there will be no loss if you open or close your *.PSD file   JPEG (*.JPG; *.JPEG; *.JPE) – joint photographic expert group used for viewing and sharing digital photos. it does not save any layers unlike the *