These are some quotes I have in my notes for the past couple of years and I believe considering these things made my code quality and planning better.

Coding

1. Any fool can write code that a computer can understand. Good programmers write code that humans can understand.
   ― Refactoring: Improving the Design of Existing Code, 1999
   
   

2. You should name a variable using the same care with which you name a first-born child.
   ― Robert C. Martin, Clean Code: A Handbook of Agile Software Craftsmanship
   
   

3. A long descriptive name is better than a short enigmatic name. A long descriptive name is better than a long descriptive comment.
   ― Robert C. Martin, Clean Code: A Handbook of Agile Software Craftsmanship
   
   

4. Don’t comment bad code—rewrite it.
   ― Brian W. Kernighan, The Elements of Programming Style
   
   

5. Premature optimization is the root of all evil.
   ― Donald Ervin Knuth, The Art of Computer Programming, Volume 1: Fundamental Algorithms
   
   

6. Functions should do one thing. They should do it well. They should do it only.
   ― Robert C. Martin, Clean Code: A Handbook of Agile Software Craftsmanship
   
   

Planning

1. If you can’t explain it to a six-year-old, you don’t understand it yourself.
   ― Albert Einstein (I’m not 100% sure)
   
   
2. The bearing of a child takes nine months, no matter how many women are assigned.
   ― Fred Brooks