'Engineering a Compiler' by Cooper & Torczon is a great resource. It gives context on each topic, explains them clearly, and at the same time, I think, it is a really good resource from an academic point of view. It still requires some investment in terms of time and effort, but I found it more approachable than the Dragon book. I would say that both cover more or less the same introductory stage to compilers construction. If you have read the Dragon book, I have the feeling that you are perfectly well prepared to write your own compiler.