Shift+F1	Help: What's this?
Ctrl+O	Shortcut for menu `File => Open`
Ctrl+W	Shortcut for menu `File => Close`
Ctrl+Q	Shortcut for menu `File => Quit`
<left-mouse click>	over menu/tool bar: activate menu/function over value mode combo: select value mode over tab: switch to tab in tree: select/deselect/expand/collapse items
<right-mouse click>	in tree: context menu
Ctrl+<left-mouse click>	in tree: multiple selection/deselection
<left-mouse drag>	over scroll bar: scroll
Up arrow	in tree: move selection one item up (+Shift: multiple selection)
Down arrow	in tree: move selection one item down (+Shift: multiple selection)
Left arrow	in scroll area: scroll to the left
Right arrow	in scroll area: scroll to the right
Ctrl+F	find tree item
F3	move to next search result
Shift+F3	move to previous search result

For keyboard shortcuts in different plugins, see the corresponding sections: