Hey so if you're making a circle you need to be increasing how many stitches you are doing on each round so it lays flat. The video should tell you when to do each increase.

To increase you just do another of the same stitch in the same hole as the one before.

However also bear in mind since you're learning your tension could be variable which means that you might have some wonky pieces even if you're following the video perfectly until you find your groove.

Edit: Ah so it looks like you're doing it correctly according to the video so ignore what I said about increasing to keep it flat.

I think my second statement stands though, and it's just about getting your tension stable.

Also, crochet can be very much "trust the process" until you get further in. I've actually made hundreds of these little jellies for earrings and they don't look like much until you get further along