Every line of code is always documented

Every line of code is inherently documented through the project's version control history. By analyzing commit messages, developers can uncover why specific lines of code were written, making history a valuable tool for understanding and improving code. Effective use of git blame, git log, and other tools can help identify who wrote specific code, when it was added, and the reasoning behind it. Improving commit messages and avoiding unrelated changes in a single commit are stressed as important practices.