Here is a link to Jordan Fabrics tutorial on binding. It was very helpful to me. Two things that I do that vary a bit from her is: 1.-Where she folds the binding down after the 45 degree fold, I lay a long pin under that top edge fold and to make sure it is aligned straight with the top of the quilt and pin in place. (read that tip someplace and makes all the difference for me) and 2 - when she finger presses the binding along the seam line where she has sewn it to the quilt, I take it to the ironing board and press the binding away from the quilt with an iron, much like what you do when pressing to the "dark side". I think I saw that tip in one of her videos where she uses an iron to press the binding after sewing it on. If using that method, no need to iron in half before sewing, just align edges as you fold and sew, the pressing after will take care of the fold. I also cut my bindings 2 1/4 inch and usually serge the edges of the quilt before adding binding.
https://www.youtube.com/watch?v=dQgjp4Upt8w&t=844s