More lines of code does not mean more progress. Similarly, writing more code does not mean you are more efficient than others. The best code should be able to complete the task concisely and concisely, which is also the most difficult to write. This is a well-known software principle, called KISS, which is short for "Keep It Simple, Stupid".
If you don’t understand which one is very good, it’s okay, you just need to remember them, and then wait for the moment of actual experience for you to deeply understand it.