Selection with Keyboard:

Shift+Right Arrow: 
Is use to select a single letter or words from right side of documents.
Shift+Left Arrow:
 is use to select single line or words towards left side of the document.
Shift+Up Arrow:
Is use to select up side of documents.
Shift+Down Arrow:
Is use to select down side of the documents.
Shift+Home:
I use to select a line from position to home.
Shift+End:
is use to select a line from position to end line of the documents.
Ctrl+Shift+F8:
and press arrow keys to select the documents in vertically and horizontally.