This is my next beginner crochet square, following the single crochet one. I suggest you master single crochet before you continue with double. The main difference is the size because double crochet is about twice as long as single crochet. Good luck!
Step 1: Materials
For this project, you'll need medium/light colored yarn, crochet hook size H-J, tape measure/ruler, darning needle, and scissors.
Step 2: Beginning Chain
This is the same as the chain when we started single crochet: wrap yarn and pull through loop on hook. Work 12 chain stitches.
Step 3: Double Crochet Stitch 1
Wrap yarn around the hook from the right to the left going under the hook and over the chain.
Step 4: Double Crochet Stitch 2
Insert hook into the 3rd chain from the hook. (remember, the 3rd "v" from the hook) (also remember, into the top half of the chain) Make sure the yarn is in between the two loops on the left side of the hook.
Step 5: Double Crochet Stitch 3
Wrap the yarn from the left side of the hook to the right side, going over the hook and between the two loops.
Step 6: Double Crochet Stitch 4
Wrap the yarn behind the hook from right to left, in front of both loops. (In order from left to right: wrapped yarn, loop from chain, wrapped yarn, loop from end of chain)
Step 7: Double Crochet Stitch 5
Like we did with single crochet, pull wrapped yarn that's closest to hook through FIRST loop only. It will now look like there are three loops. (In order from left to right: loop that you just pulled yarn through, wrapped yarn, loop from end of chain)
Step 8: Double Crochet Stitch 6
Wrap yarn as before, this time pull it through both the FIRST loop and the SECOND piece of wrapped yarn on the hook. There will now be two loops on your hook.
Step 9: Double Crochet Stitch 7
Finally, repeat step 6 one more time so there is only one more loop on the hook. One finished double crochet stitch! You should be able to see the "v" on top of the stitch.