A crochet space is a general term in crochet. Space can mean anything from a chain 1 to chain 50 or no chains between stitches. Space is not inserting your hook in a stitch. It is being inserted in a space, an empty space. From time to time, I will crochet between stitches. That is the space between stitches. Granny squares will have chain spaces to create the corners of the granny square and help them get larger. The chains in the corners are spaces. I created a video showing crochet space examples.