For the granny square you need to know how to chain stitch, slip stitch, and double crochet.
Here are the directions for the Granny Square:
Chain 4 and join with sl st to form ring.
Round 1: Ch 3 to count as first dc, work 2 more dc in ring. Ch 2 for corner. Work (3 dc, ch2) 3 times, join with sl st to top of starting ch 3. Sl st over the 3 dc into the next ch 2 corner.
Round 2: Ch 3 for first dc, work 2 dc, ch 2, 3 dc in the ch 2 space. *Ch 1, in next ch 2 space work 3 dc, ch 2 and 3 dc. Repeat from* twice, ch 1, join with sl st to top of starting ch 3.
Round 3: Sl st to ch 2 corner. Ch 3 for first dc, work 2 dc, ch 2, 3 dc as before. Ch 1 work 3 dc in ch 1 space, ch 1 work another corner as before. Continue around in same manner, join with sl st to top of starting ch 3.
Here is a picture of a Granny Square:
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Thanks everyone and enjoy.