I usually crochet my rounds in spirals: which means that I go around and around continuously. It’s an easy technique.
The main downside, though, is that if you’re crocheting stripes, you get pesky little jogs in the color changes.
The solution is to crochet in joined rounds. That means, at the start of each round, you chain one, and then slip stitch into that chain at the end of the round.
Update – If you want to keep crocheting in a spiral but minimize that pesky jog in your stripes, there’s a video here showing a different technique.
It’s pretty easy to accidentally add stitches using joined rounds… which makes a chevron shape instead of a nice, flat join. Oops.
The trick to avoiding accidental increases is to know your stitches! Here’s a little graphic of the stitches involved:
So, when you’re crocheting, you don’t want to single crochet into the slip stitch of the previous round. It’s funny because it feels like you’re skipping a stitch. But that’s the trick.