How to Make a Quilt Triangle
Take the FINISHED size of the square you want and add 7/8 of an inch.
example:
for a finished size 2 inch square you will cut your fabric 2 7/8" x 2 7/8"
for a finished size 3 inch square you will cut your fabric 3 7/8" x 3 7/8"
for a finished size 4 inch square you will cut your fabric 4 7/8" x 4 7/8"
And so on, either make you freezer paper pattern or up with a rotary cutter and ruler.

I've used a 3 inch FINISHED Square cut 3 7/8" x 3 7/8"
A light and a dark.

On the Wrong side of the light fabric draw a line from corner to corner.

Turn and do the same thing on the other side.
(when I have many to sew, I do chain piecing, one right after another, not stopping the machine until all finished and then turn and do the other side)
If NEW do them one at a time.
I recently posted a block on Facebook and there was a lot of take about points.
A light and a dark.

On the Wrong side of the light fabric draw a line from corner to corner.
This is the cutting line NOT sewing line

On your sewing machine sew a straight seam, 1/4" from the line.

(when I have many to sew, I do chain piecing, one right after another, not stopping the machine until all finished and then turn and do the other side)
If NEW do them one at a time.
Press your seam to the dark fabric and trim the end tail off.
I recently posted a block on Facebook and there was a lot of take about points.