Duplicating data from multiple layers can also be done more quickly using
some keyboard commands. Using Command + Shift + C with an active
selection copies the data contained within it to the clipboard. You can then
paste it to a new layer (Command + Option + Shift + N, Command + V). If
you would like to create a flattened copy of the entire document, use the
shortcut Command + Option + Shift + E; a composite of all visible layers
will be added as a new layer to the top of your layer stack.
Brushes
Shape and Size
Being able to quickly adjust the brush tool is crucial to getting a swift
workflow. Many know about using [ and ] to decrease and increase the