I think it is important that people understand the grain of the fabric, what cutting fabrics on different grains does for a quilt, cutting borders on the wrong grain, etc. Also important not to use the salvage as part of the cut block. Learning the correct way to press, correct process of which direction to press etc. Safety is an important process also, wearing shoes not barefeet or sandals when using rotary cutters, changing rotary blades, closing the blades, etc. I also wear safety glasses (yes, over my glasses) when I sew due to problems with broken needles or all the embellishments I use.
I learned to quilt without anyone else, no quilting store, no books, etc. and then I had to relearn. When I learned by myself, I was handstitching and I had a very fine stitch, no way to take it apart. I had no idea what a fat quarter was, how to use a rotary cutter, no idea 1/4" seam was required. I survived, but the quilt police were out for me <G>.