The no rules applies more to the aesthetics rather than construction. let your quilt look what ever way it pleases you as to color, setting, sashing, borders, quilting, etc.
Building the quilt with the best techniques possible is important to the get the best possible finish and there is more than one way to get there. The choices are there, discover the ones that work best for you.
Building a quilt takes a lot of trial and error sometimes till you find the procedures that work for you. As an example, there are many ways to make a HST so use the method that works for you. We are all quilting together but on on our own paths to the finish.
peace