Quick answer: Use this stitch library to identify the technique in a pattern, compare stitch height, and open the focused tutorial you need.
Basic Crochet Stitches
The foundation set includes chain, slip stitch, single crochet, half double crochet, double crochet, and treble crochet. Each stitch changes fabric height, density, drape, and the number of turning chains normally required.
Crochet Stitch Height
Single crochet creates short, dense fabric. Half double crochet adds height while keeping substantial texture. Double crochet builds fabric faster and with more drape. Treble crochet is taller and more open. Always follow the pattern's turning-chain rule.
Where to Insert the Hook
Unless a pattern says otherwise, insert the hook under both top loops of the next stitch. Back-loop-only crochet uses the loop farthest from you to create a ridge and extra movement. Count the top V shapes to verify the row.
Stitches in Rows and Rounds
The stitch mechanics stay the same, but the joining and turning method changes placement. Continuous rounds need a marker; joined rounds may use a slip stitch and starting chain. Never assume the chain counts as a stitch.
Fix Uneven Edges and Changing Counts
Mark the first and last real stitch, pause to count, and check whether the turning chain counts. Splitting yarn, working twice into one stitch, and missing the final stitch are common causes of accidental increases or decreases.
Use the instructions and terminology stated by the pattern you are following. Make a swatch when gauge or finished size matters.