Linux (Debian) user since long time ago, some of my actual fields of interest are currently improve my limited skills with LaTeX and R (at the same time thanks to Sweave). My apologies if you find unclear anything of what I write. English is not my native language and I've never been in any type of regular English courses.

Precooked comments: Text building blocks

Welcome to TeX.sx! Please add a minimal working example (MWE) that illustrates your problem. It will be much easier for us to reproduce your situation and find out what the issue is when we see compilable code, starting with \documentclass{...} and ending with \end{document}.

A tip: If you indent lines by 4 spaces or enclose words in backticks ```, they'll be marked as code, as can be seen in my edit. You can also highlight the code and click the "code" button (with "{}" on it).