Knit into the front and back of the same stitch
Make a yarn over between stitches
Use a lifted increase by picking up the bar between stitches and knitting into it
Knit front, back, front into the same stitch for a double increase
Cast on extra stitches at the beginning of a row
Cast on extra stitches at the end of a row
Increase evenly across a row by spacing increases at regular intervals
Use make one left and make one right increases
Use a backward loop cast-on to add stitches mid-row
Add stitches by knitting into the same stitch more than once