Perhaps the simplest stitch of all is the running stitch. Stitches are made by taking the needle in and out of the fabric. To make very even stitches, keep the same distance between each in and out of the needle. This will make the stitch and the in between stitch areas nice and even. You can vary this by making shorter or longer stitches and spaces.
Here is the running stitch used on the yellow circle – as simple as it is when you stitch it with contrasting thread it looks great.