> For the complete documentation index, see [llms.txt](https://tester-ai.gitbook.io/en/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://tester-ai.gitbook.io/en/12.-developers-mistakes.md).

# 12. Developers mistakes

Programming is done by people and they make common mistakes

Programming is 90% learning existing code and modifying it through small, easily tested portions that fit into the overall system. Writing the code itself, is only 10% of the programmer's work.

Programming is not just writing lines of code, but creativity based on logic, which should be developed in yourself.