Yarn forward means to bring the yarn to the front as if you are going to purl. If you knit the next stitch, it will create a yarn-over eyelet, which is also an increase.
If you check out the Glossary tab above, Amy has many videos and explanations of the various abbreviations in patterns.
"Trust the pattern!"
Time flies like an arrow, but fruit flies like a banana.
Hop aboard while we follow the cloud-covered van of knitting harmony, man!! Woooo!! --Hedgehog
IngridKH on Ravelry