Here is crochet donut pattern. Click the image to enlarge.
If you would like some toppings on the donut, add them before you stitch the edge together.
Each round start with making 1 chain stitch and end with joining with slip stitch in the 1st chain. You might think these extra steps are pain but these will help to equal the height of the round. It means you can make clean stripe pattern.
Please leave your question if you have one.