Latex means structure. An interesting application is to use separate tex-files for part of the document.
For example, in the preamble I put.
\input{preamble.tex}
% \input{languageA.tex}
\input{languageB.tex}
\input{locationA.tex}
% \input{locationB.tex}
The preamble file has all specifications I need to set up a regular document.
The language files hold some settings that are - obviously - language dependent. Say, one in Dutch, one in English, et cetera.
The location files hold paths that may be different on the work and home computer - even though I always use the same files on dropbox.
Then the document starts. The chapters or paragraphs can be replaced by separate files as well using either \input{} or \include{}. The former can be nested and just copies the contents of the file inside the document. The latter inserts a \clearpage as well and allows for a limitation of the files to include by using \inputonly{} in the preamble. Also, it does not return an error if the file does not exist.
