Crocheting in spiral is the basis of amigurumi making - unlike crocheting in rounds, this creates a nice even fabric without a seam where the round ends.
This also means it will not be obvious where the last stitch of a round is, so if you don't want to keep counting your stitches, use a stitch marker to mark the first or last stitch of a round to keep track. I usually just draw the starting yarn tail through the last stitch.
Tip! There are occasions where you want to crochet joining rounds, when making a stripy toy for example, but most amigurumi toys are crocheted in spiral.
1: mr, sc 6 (6)
2: inc x 6 (12)
3: (sc, inc) x 6 (18)
4: (inc, sc 2) x 6 (24)
5: (sc 3, inc) x 6 (30)
1. Start with a magic ring, crocheting six single crochet stitches into the loop. Do not join the round with a slip stitch.
2. Do not start the second round with a chain, instead insert your hook straight through the first stitch...
3. ... and complete the first single crochet stitch of the second round.
4. Continue around your piece and finish the second round. As you can see, the last stitch of the round is now already higher than the first stitch so you don't need to start the next round with a chain. Just keep crocheting in spiral.
5. And that's all there is. As you can see, you will get a nice even fabric without a seam where the round ends.