The Universal Pattern
Every standard crochet stitch follows the same escalating formula. Each stitch is one extra yarn-over taller than the one before it.
Single Crochet: zero yarn-overs before inserting, pull through both loops, turning chain 1. Half Double Crochet: one yarn-over before inserting, pull through all three loops at once, turning chain 2. Double Crochet: one yarn-over before inserting, pull through two twice, turning chain 3. Treble: two yarn-overs before inserting, pull through two three times, turning chain 4.
The number of initial yarn-overs goes up by one each time, and the pull-through-2 steps at the end match. Once you internalize this, you never need to look up a basic stitch again.
The Stitches You Actually Forget
HDC trips people up because the ending is different from every other stitch. Instead of pull through 2 repeatedly, you pull through all three loops at once. That is the one exception to the universal pattern.
Front and Back Post stitches (FPdc and BPdc) confuse people because the insertion point is different. You go around the post instead of into the top. Everything after that is identical to a regular DC. Front-to-back-to-front for FPdc, back-to-front-to-back for BPdc.
SSK in knitting feels backwards. Slip two stitches knitwise one at a time, then insert the left needle into the fronts of both and knit them together. The slipping reorients them for a left-leaning decrease.
Loop Counting as Debugging
When a stitch goes wrong, count loops on your hook. If you know how many you should have at each step, you catch errors immediately.
For SC: after pulling up a loop you should have 2 loops. After the final pull-through, back to 1. For DC: after pulling up a loop, 3 loops. After the first pull-through-2, 2 loops. After the second, back to 1. For TR: after pulling up, 4 loops. Each pull-through-2 removes one loop.
If your count is wrong, you missed a yarn over or accidentally pulled through too many. Our Stitch Quick Reference tool shows the loop count at every step for every stitch.
Turning Chains and US vs UK Terms
SC turning chain (1 chain) usually does NOT count as a stitch — work your first SC into the first stitch. DC turning chain (3 chains) usually DOES count as the first DC — skip the first stitch. HDC turning chain (2 chains) varies by pattern. Always follow your specific pattern instructions.
US and UK crochet terms are offset by one stitch height. What Americans call Single Crochet, the British call Double Crochet. What Americans call Double Crochet, the British call Treble. If a UK pattern says treble and you work a US treble, your project will be much taller than intended. Check whether your pattern uses US or UK terminology — if it mentions tension instead of gauge, it is probably British.