Summarize this article in one sentence.
Instead of holding the yarn behind the left needle, bring it in front so it's close to you. If you forget and put the yarn behind, the stitch on your left needle will look like 2 stitches instead of 1. Don't worry about making mistakes as you work on this practice swatch. Pay attention to the mistakes you make, so you know how to prevent them in the future.

Summary:
Bring the working yarn to front.