Knit 1 front and back (k1f&b)
It is one of the most commonly used increases. It is a visible increase as it creates a horizontal bar wherever you create the increase. Also known as the bar increase because of the horizontal bar it creates. To create this increase, you will need an empty peg to the right of the peg where you want the increase. Name the pegs as follows: Peg A (peg with loop on it) and Peg B (empty peg).
Step 1: Knit the stitch as usual on Peg A. Instead of popping the loop off the peg as you normally would when creating a knit stitch, place the newly formed loop on the adjacent empty peg (Peg B), leaving the original loop on Peg A and the new loop on Peg B.
Step 2: Wrap Peg A counterclockwise. Lift the bottom loop off the peg, leaving one loop on the peg.
Continue working the row.
Here is a visual for your convenience.