Yarn over（yo）
Yarn over, abbreviated yo, is one of the basic building blocks of most crochet stitches. To create different types of stitches, it may be used before or after the hook is inserted into the piece, or multiple times per stitch.
HOW TO YARN OVER (STEP-BY-STEP WITH PHOTOS)
WHAT DOES YARN OVER MEAN IN CROCHET?
Yarn over in crochet is a technique where you put your hook below and behind the working yarn. Abbreviated as YO in patterns, think of it as a building block for many stitches, like the single and double crochet stitches.
TIPS:
Tension Control: Keeping consistent tension in your yarn is crucial for even stitches. Practice wrapping the yarn around your fingers to find what works best for you.
Hook Positioning: The hook's angle can make a big difference. Ensure it's slightly tilted to catch the yarn easily without snagging.
Practice: Like any skill, practice makes perfect. Try making simple swatches of different stitches to get comfortable with the yarn over. By mastering the yarn over, you'll have a strong foundation for creating various crochet stitches
and advancing to more complex projects.