LaTeX الخطوط

\documentclass{article}

% Encoding — required for proper output with pdfLaTeX
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}

% --- Serif fonts (pick one) ---
% \usepackage{lmodern}       % Latin Modern (default, recommended)
% \usepackage{palatino}      % Palatino — elegant, slightly wider
% \usepackage{tgpagella}     % TeX Gyre Pagella — polished Palatino clone
% \usepackage{times}         % Times New Roman look-alike

% --- Sans-serif fonts (pick one) ---
% \usepackage{helvet}  \renewcommand{\familydefault}{\sfdefault}
% \usepackage{tgheros} \renewcommand{\familydefault}{\sfdefault}

% --- Monospaced fonts (pick one) ---
% \usepackage{courier}       % Courier monospaced
% \usepackage{inconsolata}   % Inconsolata — more readable

\usepackage{lmodern}

\begin{document}

This paragraph is set in Latin Modern, the default LaTeX font.

{\sffamily This text uses the sans-serif font family.}

{\ttfamily This text uses the monospaced (typewriter) font.}

\end{document}

\documentclass{article}

% fontspec requires XeLaTeX or LuaLaTeX
\usepackage{fontspec}

% Set the main (serif) font — use any font installed on the system
\setmainfont{TeX Gyre Pagella}

% Set the sans-serif font
\setsansfont{TeX Gyre Heros}

% Set the monospaced font
\setmonofont[Scale=0.9]{Inconsolata}

% Load a font with specific features
\newfontfamily\titlefont{TeX Gyre Termes}[
  BoldFont       = {TeX Gyre Termes Bold},
  ItalicFont     = {TeX Gyre Termes Italic},
]

\begin{document}

Regular text is set in TeX Gyre Pagella.

{\sffamily Sans-serif text uses TeX Gyre Heros.}

{\titlefont This paragraph uses the custom \textbackslash titlefont family.}

\texttt{Monospaced code uses Inconsolata at 90\% scale.}

\end{document}

\documentclass{article}
\usepackage[T1]{fontenc}
\usepackage{lmodern}
\usepackage{setspace}   % line spacing

\begin{document}

% ---- Font size commands ----
{\tiny       tiny (5pt)}  \\
{\scriptsize scriptsize (7pt)} \\
{\footnotesize footnotesize (8pt)} \\
{\small      small (9pt)} \\
{\normalsize normalsize (10pt)} \\
{\large      large (12pt)} \\
{\Large      Large (14pt)} \\
{\LARGE      LARGE (17pt)} \\
{\huge       huge (20pt)} \\
{\Huge       Huge (25pt)} \\

\vspace{1em}

% ---- Line spacing ----
\begin{singlespace}
  Single-spaced paragraph using the setspace package.
\end{singlespace}

\begin{doublespace}
  Double-spaced paragraph — common for draft submission.
\end{doublespace}

% Compact half-line increase
\setstretch{1.25}
Paragraph at 1.25$\times$ line spacing.

\end{document}