Rule #1 for new Darksiders: don't over think it. Rereading we did neglect to mention with the 2-2 1/4" strips that we were doing a double fold binding. To be fancy, it's technically a French binding. The theory is a double layer will hold up and last longer than a single layer. Personally I'm sure the first layer wears out the same it's just got a second layer to keep the stuffing from getting exposed. I find it an easy method, easier for me to get a consistent result and I am a very lazy quilter.
Connect the strips how you like, 10 or more inches longer than the total of the 4 edges. We kept it simple for you: some people trim the batting and backing wider than the front, by 1/4" up to the 1/2" that
@Deafoldbat uses to fill in the binding. I use the 2.25" wide fabric strips, folded double to 1 1/8" then sewn on with a generous 1/4" seam that I might as well call 3/8". Once I've finished sewing the batting on the front I flip it to the back and sew by machine, not by hand. I typically use a wider decorative stitch, especially on kids quilts.
Everybody has their own preference for how prominent they want the binding to be. The thickness of the batting comes into play as well. Summer quilts I might use flannel, very thin, so might cut 2" or 2 1/8". Normally I use Warm & Natural, a thinner cotton batting and like the look and feel from 2 1/4" strips with that 3/8" seam. The occasional thicker polyester batting I'll use 2 1/4" strips as the entire quilt is thicker and takes up more space at the edge.
Hunted around and found an
excellent short video on how to do a double fold or French binding. Lovely girl: she does it exactly how I do it. Less than 3 minutes. Note: there are some idiotic videos out there.