How to crochet a granny square

 

Abbreviations
ch = chain
chs = chains
st = stitch
sts= stitches
sl st = slip stitch
dc = double crochet

Ch 6. Join sl st when done with chain.
Ch. 3, 2 dc, ch 2, (3 dc, ch 2) 3 times, sl st to join to the 3rd chain stitch from foundation loop.

Changing Colors Between Rounds:

You can transition from one color to the next between rounds. Work in the old color right up until the very last step of the last stitch in the round. Then pull a loop of the new color through to complete the last step. Cut the old color, leaving a long tail of yarn, and continue crocheting with the new color.
There are multiple ways to attach new yarn colors. This suggestion above is one way of doing it, but there are other ways that would work just as well.

Work 3 sl sts (2 sl sts with the old color, and join the new color in the third) so that your crochet hook is adjacent to the space formed by the closest set of chain sts. Ch 3, 2 dc in space, ch 2 to form corner, 3 dc in same space, ch 2, (3 dc in next space, ch 2 to form corner, 3 dc in same space, ch 2) 3 times, sl st to join to the 3rd chain stitch you crocheted at the beginning of the round.

You can continue adding as many rounds as you want to your granny square. Each subsequent round will follow the same basic procedures used in the preceding rounds. You'll start with 3 chain stitches substituting for the first double crochet. In the corners, you will work 2 sets of 3 double crochet stitches separated by 2 chain stitches. Otherwise, you will work 3 double crochet stitches in each space, separated by 2 chain stitches on either side.

Weave in all loose ends. You may also want to block the granny square.