Here is a video with some basic info on using circular needles to knit in the round.
Two different ways you can join to begin working in the round, and if you accidentally begin knitting with a twist in the stitches, you can easily fix it on the first round.
Use this technique for hats, bags, sweaters and more. If you have never used circular needles for knitting in the round, I encourage you to try. It is not hard to do, but like everything else, will take practice and patience to become proficient.
You can get circular needles in many lengths, sizes and materials. More on that here.