For Dummies | Pattern-oriented Software Architecture

These are the high-level blueprints. They define the fundamental structure of your entire system. (Example: MVC or Model-View-Controller, which keeps your data separate from your user interface).

In software, a pattern is a within a specific context. Instead of solving every problem from scratch, you look at what has worked for thousands of developers before you. The Three Levels of Patterns Pattern-Oriented Software Architecture for Dummies

You don’t need to memorize every pattern ever invented. Start by looking at the (organizing code by responsibility) or the Broker pattern (used in distributed systems). Once you see how these patterns solve real-world headaches, the "Pattern-Oriented" mindset will start to feel like second nature. These are the high-level blueprints