Knit front and back into the same stitch
Make one yarn over
Knit into the front and back of a stitch
Knit into the front, back, and front of the same stitch
Lift the bar between stitches and knit into it
Increase by knitting into the stitch below
Use a make one left increase
Use a make one right increase
Work a yarn over increase on the next row
Follow the pattern’s specified increase method