Help with this pattern

for ex what is instep?

CO 34 sts.
Work K 1, P 1 ribbing for 24 rows.
Row 25: K 11 sts, place these sts on holder or safety pin. K 12 sts. Stop and put last 11 sts on a second holder without working.
Work center 12 sts-P 1 row, K 1 row-for 18 rows total, ending on a P row.
K 2 tog, work to end.
P 2 tog, work to end. Repeat these two rows once. (8 sts remain)
K across 8 sts of toe. With free needle, starting at cuff end of instep, pick up 11 stitches along the left side of the instep by inserting needle in the little knots at the end of the rows. K these 11 stitches. Pick up the last 11 sts from second holder and K these sts. Turn work and K 30 sts. Pick up 11 sts from the right side of the instep, and K them. Then pick up the 11 sts from the first holder and K them. (52 sts total)
Continue working garter stitch (K each row) until there are 5 ridges, ending on wrong side.
K 26, place marker, K 26
P 1 row
Decrease row: K 2 tog, K to within 2 sts of marker, K 2 tog, pass marker, K 2 tog, K to last 2 sts, K 2 tog.
P 1 row.
Repeat these last 2 rows twice. (40 sts remain on needle)
Bind off.
Sew seam at back of leg and down the sole. Repeat for 2nd bootie.
Crochet two 16 inch chains. If yarn is very thin you may use double strand. Thread into cuff about 3 rows above the instep using tapestry needle to draw chain through, going in and out four times. Tie bow in front.

Here’s a picture that shows you what the parts of a sock are:

By the way, you should edit your post and take out the pattern. You can’t post the text of patterns here, even free ones, because of copyright issues. You can post links and lines from patterns though.