I am crocheting a snuggle bunny and the two instructions:
#5. -9. Sc one round (24)
#18. -21. Sc one round. (12)
I do not understand the -9 & -21 in the pattern.
That means to do that same stitch for rows 5 thru 9 and the other is the same stitch for rows 18 thru 21.
When working on a crochet pattern you will need to know a variety of crochet stitch abbreviations to follow the instructions. This is a page about basic crochet abbreviations chart.
