Using a stitch marker is simple and can be incredibly helpful in keeping track of your knitting or crochet projects. Here's a basic guide:

1. Identify Your Stitch: Work your pattern until you reach the point where you want to place the marker. This could be the beginning of a round, a specific stitch pattern, or any point where you need to keep track.

2. Insert the Marker: Take your stitch marker and slide it onto the needle. If you're using a removable marker or crocheting, open it and place it around the stitch. If you're using a closed-ring marker, simply slide it onto the needle.

3. Continue Working: Once the marker is in place, continue working your stitches as usual. The marker will stay in place on the needle or stitch, marking the specific stitch or point in your pattern.
4. Move the Marker: As you progress in your project, you may need to move the marker. Simply slide it from one needle or stitch to the other as you come to it in your work.
5. Finish Your Project: When you no longer need the marker, simply remove it from your needle or hook.

Stitch markers come in various types, such as closed-ring markers, split-ring markers, locking markers, or bulb pins. Experiment with different types to find what works best for you and your project.