Avoid single-character variables and abbreviations in favor of descriptive, full-word names that clearly communicate the variable's purpose or content. This improves code readability and makes the codebase more maintainable for other developers. Examples of improvements: - Change `x` to `children` in function parameters - Change `str` to `string` for string parameters - Change `e` to `focusable` when iterating over focusable elements Descriptive names act as inline documentation, making code self-explanatory and reducing the cognitive load for developers reading or maintaining the code.