All good suggestions! My Quilting 101 teacher told us that if you can master half square triangles, you have mastered 99% of quilting!
I got pretty good at them and they are the foundation of a crazy amount of quilt blocks, but I found all the usual methods of making them incredibly time consuming. I finally went to printing my own sheets of HST papers, which I sew up as a kind of leaders & enders project, or for therapy sewing...I like the papers generated by "Triangulations". Don't know what I would do without that software!