How do you crochet in rounds?

Which stitch is used for joining rounds in crochet?

Remember to end the round, you must always join with a slip stitch to the Ch 1 you make at the beginning of the round and skip the slip stitch from the previous round. This is what 5 joined rounds look like. You can see the joined stitches to Ch 1 and the slip stitches from previous rounds.

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