The post discusses essential rules that developers should follow when creating terminal programs, emphasizing user experience and accessibility. Key points include the importance of respecting user settings for colors, using clear legibility in output, making sure standard output only contains the requested data, and not solely relying on color for information. It suggests keeping errors separate from regular output for better data handling and includes tips for enhancing usability in command-line interfaces (CLIs). Insights into user preferences, like customizable settings for aesthetics, and proper handling of outputs to facilitate smooth user interactions are also discussed.