Developers have been creating code since way before the appearance of with Internet, and they have been working on a number of different areas, not just web applications. Because of that, a lot of people have already had to confront similar scenarios, carrying the experience of previous attempts for fixing the same thing. In short, it means that almost surely, someone has already designed a good way of solving the problem that you are facing now.

A lot of books have been written trying to group solutions to common problems, also known as design patterns. Design patterns are not algorithms that you copy and paste into your program, showing how to fix something step-by-step, but rather recipes that show you, in a heuristic way, how to look for the answer.

Studying them is essential if you want to become a professional developer, not only for solving problems, but also for communicating with other developers. It is very common to get an answer like "You could use a factory here...