In the making of the crochet hat, the process starts with a magic circle.
It is a work of crocheting round and round and round until you get to your desired height.
The image above shows a snippet of how the circle is gotten as a base for the work, different from the slip knot with foundational stitches.
For me to make the hat, once I get the magic circle, next is to use any of your preferred stitches (single crochet, half-double crochet, double crochet, or treble crochet) to go round the loop, usually about 12 -14 stitches.
I closed the circle with a slip stitch and made a starting chain for the next round.
In the next round, to ensure my circle remains flat, I make two stitches into every opening of the previous round. This is known as INCREASING STITCHES.