I cut squares and sew both sides of center line, then cut apart. It is faster and more accurate in the long run. For me.

Ditto to what Jingle said.....since I make squares bigger so I can square HST accurately, it's just easier for me but it's a personal choice. So many techniques to accomplish the same thing.

I always did the square method, until I got my die cutter. Now I sew triangles together all the time with no issues. Do what works for you.

I have better luck when I mark. Those bias edges get to me.

I do the iron trick to mark the line and then sew 1/4 inch away (but I also cut my original squares larger and then square up)

With my die cutter, it cuts them as 2 triangles and I find no problems when they are sewn together.

Ditto here also.

I used to do it by sewing along the center line but didn't like having to trim each HST. Now I use the Easy Angle ruler and it is so much faster. The only thing I need to trim is two dog ears.

I cut all my squares diagonally and then sew. Works best for me. When I am sewing the bias edge I hold the fabrics at the square point of the triangle, never the skinny point. This keeps from stretching the bias. Ann

I guess I'm about doing the most I can in the least amount of time. It's rare, and I mean rare, that I need just one hst, so why not make two or more at once. Even with scrap quilts unless I'm truly using "scraps" I never make one at a time. The magic 8 method is my favorite for making more than 4. I have heard of a method to make 16 or 18, not sure, and 25, again not sure of the number. I haven't tried then yet, but I will; there are a couple of patterns I was to make that are mostly hst's.