The Foundation Single crochet or FSC, is an alternative technique to the traditional way of beginning crochet projects which usually starts with a specific number of chains, a turning chain and a row of single crochets.
Create a slip knot and chain (CH) 2.
Insert your hook into the first CH and pull up a loop. Yarn over (YO) and pull through a loop,
YO and pull through both loops. This is your first FSC.
Insert your hook underneath the two horizontal bars in the stitch below and pull up a loop.
YO and pull through a loop, YO and pull through both loops.