The M1 increase is the most invisible one I know. Amy has video of several differen M1 increases, and I'm not sure without watching them which is the one I like, so I'll describe it.
Slip your left needle tip under the bar between two stitches from front to back. On the front of the needle they'll be a long strand and at the back of the needle there's a little loop. Knit into the little loop. It can be awkward, but it works.
"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