Efectivamente Pertenece Adepto latex can be used only in the preamble alquitrán Álbum de graduación Reductor
How to cite in LaTeX – reloaded
Packages – Using LaTeX in Pressbooks
How to edit LaTeX preamble in source pane under LyX? - TeX - LaTeX Stack Exchange
GitHub - SSoelvsten/latex-preamble-and-examples: A LaTeX preample for Computer Science handins and presentations (Danish and English) with reverse-engineerable examples
Adding Commands to the Preamble
Latex - Uneven cell width using multicolumn - Stack Overflow
pdflatex - What is the cause of "Latex Error: The font size command /normalsize is not defined" - Stack Overflow
The preamble in LaTeX with overleaf (v2) - YouTube
LaTeX and Overleaf | Methods Bites
amsmath - Why must \DeclareMathOperator be in the preamble? - TeX - LaTeX Stack Exchange
Typesetting exams in LaTeX - Overleaf, Editor de LaTeX online
TeX/Latex - Can be used only in preamble
Texmaker (free cross-platform latex editor)
Multi-file LaTeX projects - Overleaf, Editor de LaTeX online
margins - Indent entire section using only preamble - TeX - LaTeX Stack Exchange