Utilise the Shift key to easily select text.

You may have read a previous blog, that the arrow keys are used for moving your insertion point around, and the CTRL key is used to modify that movement. Using the Shift key to modify a lot of those key combos lets you select text in different ways.

• Shift+Left/Right Arrow: Extend your current selection by one character to the left or right
• Ctrl+Shift+Left/Right Arrow: Extend your current selection by one word to the left or right
• Shift+Up/Down Arrow: Extend selection up or down one line
• Ctrl+Shift+Up/Down Arrow: Extend selection to the beginning or end of the paragraph
• Shift+End: Extend selection to the end of the line
• Shift+Home: Extend selection to the beginning of the line
• Ctrl+Shift+Home/End: Extend selection to the beginning or end of the document
• Shift+Page Down/Page Up: Extend selection down or up one screen
• Ctrl+A: Select the entire document
• F8: Enter selection mode. While in this mode, you can use the arrow keys to extend your selection. You can also press F8 up to five times to extend the selection outward. The first press enters selection mode, the second press selects the word next to the insertion point, the third selects the whole sentence, the fourth all the characters in the paragraph, and the fifth the whole document. Pressing Shift+F8 works that same cycle, but backwards. And you can press Esc any time to leave selection mode. It takes a little playing with to get the hang of it, but it’s pretty fun!
• Ctrl+Shift+F8: Selects a column. Once the column is selected, you can use the left and right arrow keys to extend the selection to other columns.

 Also read Word Text Navigation Shortcuts.