These are some of my most used keyboard short cuts
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Syntax aware selection in the editor selects a word at the caret and then selects expanding areas of the source code. For example, it may select a method name, then the expression that calls this method, then the whole statement, then the containing block, etc.:
Ctrl+W
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Basic Code Completion, to complete methods, keywords etc.:
Ctrl+Space
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Go to Declaration. Use this to navigate to the declaration of a class, method or variable used somewhere in the code:
Ctrl+B
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Introduce Variable Refactoring, to create a variable from an expression. This expression may even be incomplete or contain errors. Since version 8, IDEA intelligently selects a likely expression when no text is selected:
Ctrl+Alt+V