Video shows how to make the firecracker quilt block. She shows how to add the triangles and trim up the block while allowing enough fabric for the seam allowance. Then she shows how to align the firecracker blocks to make the quilt.
The video also explains a similar but different type of quilt block that you can make with different fabric colors. She goes in detail about making the strips and assembling the blocks.
Early Firecracker, Part 2
Then watch part 3 which shows you how to do the stitch in the ditch for the strips.