Of course it depends what those bad habits are. Sometimes people's bad habits involve trying to do things traditional typesetters or designers would never do - for example, setting very narrow margins. I would recommend reading a bit about the craft of typesetting in the traditional sense and reading about the ideas of traditional style design. The TeXBook is a good source for references.
Sometimes bad habits in LaTeX involve hard-coding things like theorems instead of using environments, for example, \textbf{Theorem 1} {\it This is my theorem.}
However, it doesn't sound like your bad habits are of this nature. Maybe you should give us some examples of the kind of bad habits you have in mind.
