Last year at about this time I taped a class for Craftsy called Save Our Stitches: Fixing Knitting Mistakes.
If you follow the link below, you can get 50% off the price of the class, which will teach you how to read charts, how to identify what different stitches, increases, and decreases look like, and how drop down stitches to correct mistakes made a few rows below (even how to drop and pick up edge stitches!)
www.craftsy.com/ext/AnnBudd_4000_H
My goal with this class is to help you learn to “read” your knitting (which makes it much easier to find your place) and understand how to fix the mistakes you do happen to make. I hope it works for you!