from a specific chapter, such as Bernoulli equations or Laplace transforms, to see how the book's method works?
The back of the simplified differential equation by dela fuente pdf usually has a summary. Photocopy that page (or screenshot it). Memorize the three crucial things:
This is not a novel; it is a review guide. It assumes you have basic calculus down (integration and differentiation) but knows you need help applying it to DEs.