Getting a program to run is one thing. Writing code that other people — or future you — can read, maintain, and build on is another.
Most programming courses focus on the first part. Syntax, logic, algorithms. You learn how to make things work. But in the real world, working code is only the starting point. The programs you write will be read by teammates, reviewed before they ship, modified months later when requirements change, and debugged at the worst possible moment. How that goes depends less on whether your code runs and more on whether anyone can understand it.
Good code isn’t just technically correct. In practice it means several things at once:
Technically elegant — solving the problem efficiently, without unnecessary complexity or redundancy.
Readable and maintainable — written so that someone unfamiliar with it can understand what it does, why decisions were made, and where to make changes safely.
These habits are easier to build from the start than to fix later. A codebase that grows without structure becomes progressively harder to work with — and the person who has to deal with it is often you, six months down the line, wondering what you were thinking.