How do you read crochet brackets and parentheses?
Understanding Symbols In Crochet Patterns
Brackets [ ] are used to set off a group of instructions worked a number of times. For example, “[ch 3, sc in ch-3 sp] 7 times” means to work the instructions inside the [ ] seven times. Brackets [ ] also set off a group of stitches to be worked in one stitch, space or loop.