There are only two main stitches in knitting. The knit stitch or plain stitch and the purl stitch. By combining these stitches in various ways, many different patterns can be created. Lots of patterns look very complicated but if you can do a knit stitch and a purl stitch you should be able to manage most patterns.
At the side of this narrative to the right, you will see links to not only the simple knit stitch and purl stitch but also lots of different combination sts.
If you find you need to know how to do something in a pattern you have found somewhere and that technique is not listed here, please feel free to ask on the chat page.