Edging

Would some one tell me what edging means??? my project is curling on the edges and what do i do to stop this??? :thinking:

There are two ways to edge a project – either knit a different stitch around the edges (i.e. for a scarf: 3 rows of garter stitch at the beginning, then 3 stitches of garter at the beginning and end of each row, 3 rows of garter at the end) or, after you’re finished, pick up stitches around the edge of the piece and either knit or crochet a border to keep it from rolling.