Extending

Shift + Home	Extends the selection to the beginning of the line
Shift + End	Extends the selection to the end of the line
Shift + Up Arrow	Extends the selection one line up
Shift + Down Arrow	Extends the selection one line down
Shift + Left Arrow	Extends the selection one character to the left
Shift + Right Arrow	Extends the selection one character to the right
Ctrl + Shift + Home	Extends the selection to the beginning of the document
Ctrl + Shift + End	Extends the selection to the end of the document

Shift + Home Extends the selection to the beginning of the line
Shift + End Extends the selection to the end of the line
Shift + Up Arrow Extends the selection one line up
Shift + Down Arrow Extends the selection one line down
Shift + Left Arrow Extends the selection one character to the left
Shift + Right Arrow Extends the selection one character to the right
Ctrl + Shift + Home Extends the selection to the beginning of the document
Ctrl + Shift + End Extends the selection to the end of the document