You've chained four stitches, joined them into a ring, and now you're staring at a loop of yarn that looks less like the start of a blanket and more like a knot with ambitions. The pattern says "work 3 dc into ring, ch 1" and you're not sure whether the chain-1 goes inside the ring or after it, and whether the ring itself counts as a stitch. Every granny square tutorial you've found either skips that part or assumes you already know it. So let's fix that.
A granny square is four corner clusters worked into a ring, then each subsequent round works clusters into the gaps between clusters and corners into the corner spaces. That's the whole architecture. Once you see it, you stop needing the pattern. The square grows by adding one cluster per side per round, and the corners stay corners because you work two clusters separated by chain stitches into the same space every time you reach one. The reason it's the classic beginner project isn't that it's easy in some vague sense — it's that it's forgiving. Tension varies, your count drifts, and the square still looks like a square. That forgiveness is worth more than precision when you're learning.
Start with the right hook and yarn combination
Use a 5.00 mm hook — H-8 in the Craft Yarn Council standard system — with worsted-weight yarn. That pairing is the one most often recommended for learning to crochet with medium-weight yarn, and it's the combination that makes granny squares behave the way the tutorials show. If your yarn is lighter, a 4.00 mm G-6 is the medium hook commonly used with worsted for beginner projects like basic blankets and hats; if you're working medium to light bulky yarn, a 5.50 mm I-9 gives you the looser fabric you want for baby blankets and simple hats. The diameter matters more than the letter. A G-6 is 4.00 mm, an H-8 is 5.00 mm, an I-9 is 5.50 mm, and those are real differences in the finished fabric, not label variations.
Thread-weight crochet is a different world. A steel hook size 1 is 2.75 mm and is meant for crochet thread — lace edgings, doilies, detailed work. You can make a granny square with it, and people do, but the square will be the size of a coaster and your hands will know it. Start with yarn.
One more thing about hooks: if you're coming from sewing, don't map the sizing across. Machine needles run from NM 60 to NM 130 in the Schmetz system, and that range tells you nothing about crochet hooks. Different craft, different scale, different logic.
Make the center ring and your first round
Chain four stitches, then slip stitch into the first chain to close the ring. That's the standard start. The alternative is a magic ring — an adjustable loop you crochet over and then pull closed — and it's genuinely better if you're making a circle, a heart, or anything where a visible hole in the center bothers you. For a granny square, the hole is covered by the first round of clusters, so the chain-four ring is fine and it's easier to hold onto while you learn.
Work your first round into the ring itself, not into individual chain stitches. Push the hook through the middle of the loop, yarn over, pull up a loop, yarn over, pull through both loops — that's a half double crochet, and it's the stitch you'll use constantly for circles and for the softer, denser fabric of hats and baby items. For a granny square you want double crochet instead: yarn over first, insert into the ring, yarn over, pull up a loop, yarn over and pull through two loops, yarn over and pull through the last two.
Make three double crochets into the ring. Chain two. Make three more double crochets. Chain two. Three more. Chain two. Three more. Chain two. Slip stitch into the top of the first double crochet to close the round. You now have four clusters and four corners. If you're counting, you have twelve double crochets and four chain-2 spaces, and if you don't have that, undo the round and try again — the first round is the one worth redoing, because every round after it inherits the mistake.
Work the second round and see the pattern
Chain three and turn, or chain three and don't turn — either works, and the difference is whether your square has a visible seam ridge running up one side. Most granny square patterns don't turn. The chain three counts as your first double crochet of the round.
Work two more double crochets into the same corner space you just came out of. That's your first corner: three double crochets, chain two, three double crochets, all in the same chain-2 space from the previous round. Then chain one, and work three double crochets into the next chain-2 space — but this one is a side, not a corner, so you don't chain two after it. You chain one and move on. When you reach the next corner space, work the full corner: three double crochets, chain two, three double crochets. Chain one. Continue around.
The rhythm is: corner, chain one, side cluster, chain one, corner, chain one, side cluster, chain one. Four corners, four sides, and every round adds one more side cluster between each pair of corners. Round three has two clusters per side. Round four has three. That's the whole growth pattern, and it's why a granny square gets bigger predictably without you measuring anything.
Change colors and fix what goes wrong
To change colors, work the last double crochet of a cluster until you have two loops left on the hook, drop the old color, pick up the new one, and pull it through those two loops. Then chain with the new color and continue. Do this at the end of a round if you want clean color blocks, or mid-round if you want the color to shift within a side — both are legitimate, and mid-round changes are how you get the diagonal color effects in a lot of granny square blankets. Cut the old yarn leaving a tail long enough to weave in, and weave it through the back of the work with a blunt needle rather than knotting it, because knots work loose in a blanket that gets washed.
The common failures are predictable. Your square curls because your tension is too tight — go up a hook size and see if it relaxes. Your corners round off because you're not putting both clusters in the same corner space, or because you're skipping the chain-2 between them. Your sides bulge because you're adding extra chain stitches between clusters; you need one, not two. And your square comes out lopsided because you're not counting, which is the one thing worth counting until the pattern is in your hands.
Decide what the square is for before you make twenty
Make one square first, all the way through four or five rounds, and look at it. Measure it. Then decide whether you like the fabric. A granny square made with an H-8 and worsted is a different object than one made with an I-9 and the same yarn — looser, drapier, faster to grow. If you're making a blanket, the hook and yarn you choose now determines how many squares you need, and finding that out after you've made thirty is demoralizing.
Join squares with a slip stitch through the back loops for a flat seam, or single crochet them together for a visible ridge. Both hold. The flat seam is better for blankets that will be folded and stacked; the ridge is better for anything where you want the joins to read as part of the design.
And if you want to move on from squares, the same skills carry straight over. A circle is a granny square without corners — you increase evenly every round instead of clustering at four points. A heart is a circle with a dip worked into the top. The half double crochet you learned for the center ring shows up in both. Nothing here is wasted.