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— title: The quality of your LaTeX category: programming tags:
permalink: /FAQ-latexqual —
The [`l2tabu`](https://ctan.org/pkg/l2tabu) tutorial (mentioned in [online introductions](FAQ-man-latex)) is undoubtedly a good read.
However, it's always difficult to remember the things you should _not_ do, when there are so many things to remember that you really must do: some automation is useful….
The nicely-named [`nag`](https://ctan.org/pkg/nag) allows you to apply a configurable set of checks to your document, as you run it through LaTeX; you get messages like: ```latex Package nag Warning: Command \bf is an old LaTeX 2.09 command. (nag) Use \bfseries or \textbf instead on input line 30. ```
(the package provides a demo file which contains most of the sorts of errors you might make — the example is one of them).
While [`l2tabu`](https://ctan.org/pkg/l2tabu) and [`nag`](https://ctan.org/pkg/nag) alert you to _possible_ programming errors, you should not forget that they are merely commenting on _style_; don't assume that a [`nag`](https://ctan.org/pkg/nag) error is going to damn your code — rather, note the issue and try to train your fingers not to do the same “next time”.
The `lacheck` program analyses your source and comments on it; its view of what is “bad” is _very_ subjective (the documentation says), but it can be useful.