The slip knot is the first step for many crochet projects. It is the way to secure the yarn on your hook in order to create the foundation (beginning) chain.
How to tie the slip knot
Make a loop several inches from the end of the yarn, insert the hook through the loop and draw the working end of the yarn through.
You should now have a loose slip knot on your crochet hook. Leave the knot on the crochet hook and pull gently on both ends of the yarn to tighten it, but don’t make it too tight as the crochet hook should move easily inside the loop.
Your slip knot is now finished and you can move to the next step which is the chain stitch (ch).