Knitting into the front and back of a stitch is an increase. It makes the piece wider. Check in the Abbreviations section and look at the video for kfb. It's not difficult.
Welcome, by the way!
"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