Here is quick go-to guide for everything you'll ever need to know about neckties:
Four-in-hand: This knot is the most common due to its simplicity. It is typically narrow and slightly asymmetrical.
Half Windsor: This knot is slightly larger than the four-in-hand and is symmetrical in shape.
(Full) Windsor: This knot is wide and symmetrical in shape. It is noticeably thicker than the other two styles.
source: wikipedia.com via The 85 ways to tie a tie (Thomas Fink and Yong Mao)