Hold the yarn with the tail end in your hand
Make a loop with the yarn, crossing the tail over the working yarn
Insert your fingers or crochet hook through the loop
Grab the working yarn
Pull the working yarn through the loop
Tighten gently to form a slip knot
Place the loop on your crochet hook
Pull the tail and working yarn to adjust the knot size
Keep the knot snug but able to slide on the hook