Hotkeys/Selecting

Ctrl+A	Selects entire text of the document.
Ctrl+Num*	Selects the entire line, or adds another line into the selection.
Ctrl+D	Selects a word that begins or continues to the right from the caret. If no word is there, selects all white-spaces or a single character otherwise.
Ctrl+Shift+D	Adds next word that begins or continues to the right from the caret (as described above) to the selection.