One-colour brioche stitch
Each brioche knit works a stitch and its yarn-over together, building a deep rib.
Counted practice swatch
Cast on 20 loosely. sl1yo means bring yarn forward, slip one purlwise, then pass yarn over the needle; it creates a paired stitch and wrap.
Work the repeat
Setup row: [sl1yo, k1] to end. Every following row: [sl1yo, brk1] to end. brk1 means knit the next stitch together with its accompanying yarn-over. Repeat, keeping paired loops together.
Read the fabric
Count the base stitches, not each yarn-over as an extra stitch. A loose wrap belongs to its slipped stitch; do not knit it alone.