Make a slip knot and put it on your hook.
Yarn over (wrap the yarn around the hook from back to front).
Pull the yarn through the loop on the hook. Done!
Build up a number of these by repeat steps 2 and 3 and you can see why it’s called a chain. Each “v” shape is one stitch.
Chains are used to start most flat crochet projects (blankets, scarfs etc.). In amigurumi they’re used for more unusual shapes – open pipes, where the chain has to be joined, or as a decorative belt.