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Hi,
I think I solved it, so I am going to post how I did it in case someone has the same problem XD.
I work with a book class of document, so if we want a horizontal line appearing after the title "Contents" in the ToC, we must add in the preamble:
\usepackage{tocloft}
\renewcommand ...

Hi!

I would like to add a horizontal line after all my Chapter headings and also after the TOC title, so it looks this way:

Contents
--------------------------------------------------------------

Chapter 4
--------------------------------------------------------------
Title of the Chapter 4 ...