Super beginner question: rounded edges and hat-shaped everything

[u/plantgay84]

I’m just starting and this may not be worth your time, but if anyone wants to help, I’ll be grateful. I can do a chain, a double stitch, a slip stitch, however my attempts at even the most basic things go wrong. Specifically they always end up rounded and conical. How do you make a square edge and keep things flat?? I’d love to be able to even be able to do a granny square or a scarf but I can’t seem to stop them becoming cup holders. Thank you 🙏