The Two-Needle Foundation
Knitting uses two needles and a single continuous strand of yarn to build fabric from the bottom up. You cast stitches onto one needle, then use the second needle to pull new loops through those stitches in a repeating pattern. Each row you complete stays on the needles as the foundation for the next row. The result is interlocking loops that hold together without knotting.
The needles themselves are straightforward tools — usually straight sticks with a point at one end and a stopper at the other to keep stitches from sliding off. Needle size matters because thicker needles create looser, larger stitches, while thinner needles create tight, dense fabric. The yarn thickness and needle size work together to determine how your finished piece will look and feel.
Key Takeaways
- Knitting creates fabric by pulling loops of yarn through existing loops using two needles, building one row at a time from bottom to top.
- The knit stitch and purl stitch are the two basic stitches; all other patterns combine these two in different sequences.
- You cast stitches onto one needle to start, then transfer them between needles as you work, keeping live stitches on the working needle at all times.
- Tension — how tightly you pull the yarn — directly affects stitch size and fabric appearance, and it varies naturally between knitters.
- Mistakes can be fixed by dropping back a few rows and re-knitting, or by using a crochet hook to pick up dropped stitches.
Casting On: Starting Your Stitches
Before you knit, you must create a row of loops on one needle. This is called casting on, and it anchors your yarn to the needle so you have something to knit into. The most common method is the long-tail cast-on: you make a loop with the yarn, pull the working yarn through it, and repeat until you have the number of stitches your pattern calls for.
Different cast-on methods create different edges. A long-tail cast-on produces a stretchy, finished-looking edge suitable for most projects. A cable cast-on creates a firmer edge. A provisional cast-on uses a temporary yarn so you can later pick up those stitches and knit in the opposite direction. The pattern you are following will specify which method to use, or you can choose based on what edge you want your finished piece to have.
The Knit Stitch and Purl Stitch
The knit stitch is the foundation of knitting. You insert the right needle through a loop on the left needle from left to right, wrap the yarn around the right needle, and pull it back through the loop, creating a new stitch on the right needle. The old loop slides off the left needle. When you knit every stitch in every row, you create garter stitch — a bumpy, reversible fabric that looks the same on both sides.
The purl stitch is a knit stitch worked backwards. You insert the needle from right to left, wrap the yarn, and pull through. A purl stitch looks like the back of a knit stitch. When you alternate knit and purl stitches in the same row, you create stockinette stitch — smooth on one side, bumpy on the other. Most sweaters and fitted garments use stockinette because it drapes well and shows stitch definition.
Every knitting pattern is built from combinations of knit and purl stitches. Cables, ribs, Fair Isle patterns, and lace all use only these two basic stitches arranged in different sequences. Once you can execute a clean knit and purl, you can follow any pattern.
How Stitches Transfer Between Needles
Knitting always involves two needles: the left needle holds the stitches you are about to work into, and the right needle collects the new stitches you are creating. When you finish a row, you swap the needles — the right needle becomes the left needle, and you pick up the empty needle as your new right needle. This reversal is why knitting moves back and forth across the fabric rather than spiraling around it.
The stitches stay live on the needles throughout your work, meaning the loops remain open and connected to the working yarn. This is different from crochet, where you work with a single hook and only one active loop at a time. Because your stitches are always accessible on the needles, you can easily fix mistakes by unraveling a few rows and re-knitting them.
Tension and How It Shapes Your Fabric
Tension is how tightly or loosely you pull the yarn as you knit. If you pull hard, your stitches will be small and dense. If you pull gently, your stitches will be loose and open. Tension directly affects the finished size of your piece — two knitters following the same pattern with the same yarn and needles can end up with different-sized garments if their tension differs.
Most patterns include a tension gauge: a statement like "20 stitches and 28 rows over 4 inches in stockinette stitch on size 6 needles." Before starting a fitted garment, you knit a small sample, measure it, and adjust your needle size if your tension is off. Thicker needles loosen tension; thinner needles tighten it. Tension naturally varies between knitters and even within the same knitter on different days, so checking your gauge prevents surprises when you finish.
Binding Off: Finishing Your Stitches
When you reach the end of your knitting, you cannot straightforward slide the stitches off the needle — they will unravel. Instead, you bind off by knitting two stitches, then pulling the first stitch over the second and off the needle. You repeat this across the row until one stitch remains. That final stitch is cut and pulled through, locking the edge.
A standard bind-off creates a firm edge. A stretchy bind-off uses a larger needle or a special technique to keep the edge from being too tight. Like cast-on methods, the bind-off you choose affects how your finished piece looks and wears. Most patterns specify which bind-off to use, or you can choose based on whether you want a flexible or structured edge.
Common Mistakes and How to Fix Them
Dropped stitches — loops that slip off the needle — are the most common mistake. If you notice a dropped stitch, you can use a crochet hook to pick it back up by catching the loose loop and pulling it through the rows above. If you drop a stitch several rows back and do not notice when ready, you may need to unravel back to that point and re-knit.
Twisted stitches happen when you accidentally wrap the yarn the wrong way around the needle. They look distorted and uneven. The fix is to unravel back to the twisted stitch and re-knit it correctly. Increasing and decreasing stitches — adding or removing stitches to shape a garment — are intentional techniques, not mistakes, and they follow specific methods so the shaping looks neat and intentional.
Frequently Asked Questions
Why do my stitches look uneven?
Uneven stitches usually mean your tension is inconsistent — you are pulling the yarn tighter on some stitches than others. This is normal when you are learning. As you knit more, your hands develop muscle memory and your tension will even out naturally. Focusing on keeping the same distance between your fingers and the needle helps.
What happens if I drop a stitch?
A dropped stitch will unravel downward if you do not catch it. Use a crochet hook to pick up the loose loop and pull it back through each row above until the stitch is restored to the needle. If you do not notice until many rows later, you may need to unravel back to that point. Dropped stitches are fixable and happen to every knitter.
How do I know if my tension is right?
Knit a gauge swatch — a small square in the stitch pattern your project uses — and measure how many stitches and rows fit in 4 inches. Compare this to the gauge listed in your pattern. If your swatch is too loose, switch to thinner needles. If it is too tight, switch to thicker needles and knit another swatch to check.
Can I fix a mistake from several rows back?
Yes. You can unravel your knitting back to the mistake by pulling the working yarn and letting the stitches drop, then pick up the stitches on your needle and re-knit from that point. It takes practice to do this smoothly, but it is always possible. Some knitters use a lifeline — a spare yarn threaded through a row — so they can safely unravel without losing stitches.
What is the difference between knit and purl?
A knit stitch is worked with the needle entering from the left; a purl stitch is worked with the needle entering from the right. They create opposite textures — a knit stitch looks smooth on the front and bumpy on the back, while a purl stitch looks bumpy on the front and smooth on the back. Combining them in patterns creates different fabric textures and designs.