I'm just learning crochet and doing a granny square with colour change each round . Can I check how best to end a round? I'm doing a slip stitch to join into the top of first chain 3/ treble but then not sure quite how to finish. The you tube vids I've watched all then do ch 1 to sort of finish it? Is that right? It sort of affects the shape a bit ? But if you don't do that I'm guessing it would be loose and unravel ?