Here’s the thing. Nobody knows what they’re doing. Let me explain.

Suppose you have a programming problem and a program or library exists already to solve it. Great! Use that.

Otherwise, write a program to solve the problem. Done! That problem will never need to be solved again, because the code already exists.

In other words, if you’re doing your job as a programmer, you’ll always be solving a new and different problem than you’ve seen before. A programmer that’s solving the same program over and over again is a bad programmer because they haven’t successfully abstracted away the common elements.

Any programmer that claims to know what they’re doing, doesn’t.