Dear Josefa,
Garter stitch is a great pattern for beginners because you only knit every row—both right-side and wrong-side rows. Beginners usually find knit stitches easier than purl stitches.
This pattern is also called garter stitch, simply because you only knit.
Here are a few examples to illustrate. You can achieve particularly beautiful results with gradient yarns, different types of yarn, or leftover yarn.
This stitch pattern also doesn’t stretch out as much because the garter ridges hold it together well. This means that the finished piece usually turns out a bit thicker than, say, one knitted in stockinette stitch. And you’ll need more yarn, too. I really enjoy knitting it to use up leftover yarn. You can even knit it while watching TV.
Best regards, Ina
Various yarns:

Gradient yarn:
Colorful leftover yarn, a different color in each row: