As powerful as LaTeX is, users, especially beginners, often encounter a variety of errors, unexpected behaviors, and formatting inconsistencies. These issues can range from minor typographical quirks to compilation failures that prevent document output entirely. Understanding how to diagnose and resolve such problems is essential to using LaTeX effectively and efficiently. This chapter is designed to guide you through the most common challenges faced while working with LaTeX, including missing packages, undefined commands, compilation errors, and layout inconsistencies. It provides practical strategies for debugging documents, reading and interpreting log files, and narrowing down the source of an error through systematic isolation. In addition to troubleshooting, this chapter emphasizes best practices that can help prevent many issues before they arise. Topics include organizing source files, using version control, commenting and structuring code, choosing reliable packages, and writing modular and reusable content. By adopting these habits, you can significantly improve the maintainability, scalability, and clarity of your LaTeX projects. Whether you are working on a short article or a full-length dissertation, mastering these troubleshooting techniques and incorporating best practices will enhance both your workflow and your final output. This chapter serves as a reference you can return to whenever you encounter obstacles or seek to refine your LaTeX development process.