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+% "30m" but took me 2h.  Very informative.  I've copy pasted the examples here
+% to play with them.  Reading this tutorial before starting big LaTeX projects
+% (like my thesis) would've been very beneficial and safe me some time and
+% headaches.  I'm happy I've read it and completed it now,  some concepts are
+% now much clearer.
+%
+% Ref.: https://www.overleaf.com/learn/latex/Learn_LaTeX_in_30_minutes
+
+% preamble ("setup" section)
+% ============================================================================
+\documentclass[12pt, a4paper]{article}
+% document class: article (other options include book and report)
+% aditional options: 12pt font (default is 10pt), a4paper size
+
+% Loading packages `\usepackage[options]{package}`
+\usepackage{graphicx}
+\graphicspath{{img/}}
+\usepackage{amsmath}    % For the "equation*" environment
+\usepackage{parskip}    % Used to typeset paragraphs with larger spacing
+% \usepackage[
+%     total={6.5in,8.75in},
+%     top=1.2in, left=1.0in, includefoot
+% ]{geometry}
+
+\title{My first LaTeX document}
+\author{Hubert Farnsworth\thanks{Funded by the Overleaf team.}}
+\date{September 2023}
+% \date{\today}
+
+
+% actual content
+% ============================================================================
+\begin{document}
+\maketitle
+\tableofcontents
+\begin{abstract}
+    This is a simple paragraph at the beginning of the document. A brief
+    introduction about the main subject.
+\end{abstract}
+
+% \part{Learn}
+
+% \chapter{Learn \LaTeX}
+
+\section{Basic typesetting}
+
+First document. This is a simple example, with no extra parameters or packages
+included.
+
+We have now added a title, author and date to our first \LaTeX{} document!
+
+Some of the \textbf{greatest}
+discoveries in \underline{science} 
+were made by \textbf{\textit{accident}}. (\textit{italics}.)
+
+% emphasize (toggles italics depending on context)
+% (some packages, such as Beamer, change the behaviour of the \emph command.)
+Some of the greatest \emph{discoveries} in science were made by accident.
+
+\textit{Some of the greatest \emph{discoveries} in science were made by accident.}
+
+
+% "starred version" of the appropriate command 
+\section*{Unnumbered section}
+% unnumbered sections aren't added to the TOC by default
+\addcontentsline{toc}{section}{Unnumbered Section}
+
+Lorem  ipsum  dolor  sit  amet,  consectetuer  adipiscing  
+elit. Etiam  lobortisfacilisis sem.  Nullam nec mi et 
+neque pharetra sollicitudin.  Praesent imperdietmi nec ante. 
+Donec ullamcorper, felis non sodales...
+
+
+\section{Figures}
+
+% images
+
+% The \includegraphcs command is provided (implemented) by the graphicx package
+Lorem Ipsum Lorem Ipsum Lorem Ipsum 
+How is text rendered just before an image?
+\includegraphics[width=0.25\textwidth]{rocas}
+How is text rendered right after an image?
+
+% figures: captions, labels, references
+
+\begin{figure}[h]
+    % Code here is encapsulated by the "figure" environment
+    \centering
+    \includegraphics[width=0.15\textwidth]{rocas}
+    \includegraphics[width=0.30\textwidth]{rocas}
+    \includegraphics[width=0.60\textwidth]{rocas}
+    \caption{From the top left, clockwise: Unas roquitas relajandose, unas rocas
+    relajandose, unas rocotas relajandose.}     
+    % Caption can be placed above or below the list of figures
+    \label{fig:rocas}
+\end{figure}
+ 
+As you can see in figure \ref{fig:rocas}, the rocks are happyto see their owner.
+(This example is on page \pageref{fig:rocas}.)
+
+
+\section{Lists}
+
+% lists
+
+\begin{itemize}
+    \item The individual entries are indicated with a black dot, a so-called bullet.
+    \item The text in the entries may be of any length.
+\end{itemize}
+
+\begin{enumerate}
+    \item This is the first entry in our list.
+    \begin{enumerate}
+        \item This is the 1.1 entry in our list.
+        \begin{enumerate}
+            \item This is the 1.1.1 entry in our list. Things begin to look messy
+            \begin{enumerate}
+                \item This is the 1.1.1.1 entry in our list. Things begin to look messy
+                in the source code.
+                % Maximum default depth (4) reached, further is invalid
+                % \begin{enumerate}
+                %     \item This is the 1.1.1.1 entry in our list. Things begin to look messy
+                %     in the source code.
+                %     \item The list numbers increase with each entry we add.
+                % \end{enumerate}
+                \item The list numbers increase with each entry we add.
+            \end{enumerate}
+            in the source code.
+            \item The list numbers increase with each entry we add.
+        \end{enumerate}
+        \item The list numbers increase with each entry we add.
+    \end{enumerate}
+    \item The list numbers increase with each entry we add.
+\end{enumerate}
+
+
+\section{Math}
+
+% math
+
+% inline math uses the "math" environemnt
+\begin{math} E=mc^2 \end{math} is typeset in a paragraph using inline math
+mode---as is $E=mc^2$, and so too is \(E=mc^2\).
+
+% display math  uses the "displaymath" or the "equation" environment
+% (usage of $$ is no longer recommended).
+The mass-energy equivalence is described by the famous equation
+\[ E=mc^2 \] discovered in 1905 by Albert Einstein. 
+In natural units ($c = 1$), the formula expresses the identity
+\begin{equation} E=m \end{equation}
+
+% more examples
+
+Subscripts in math mode are written as $a_b$ and superscripts are written as
+$a^b$. These can be combined and nested to write expressions such as
+
+\[ T^{i_1 i_2 \dots i_p}_{j_1 j_2 \dots j_q} =
+T(x^{i_1},\dots,x^{i_p},e_{j_1},\dots,e_{j_q}) \]
+
+We write integrals using $\int$ and fractions using $\frac{a}{b}$. Limits are
+placed on integrals using superscripts and subscripts:
+
+\[ \int_0^1 \frac{dx}{e^x} =  \frac{e-1}{e} \]
+
+Lower case Greek letters are written as $\omega$ $\delta$ etc. while upper case
+Greek letters are written as $\Omega$ $\Delta$.
+
+Mathematical operators are prefixed with a backslash as $\sin(\beta)$,
+$\cos(\alpha)$, $\log(x)$ etc.
+
+% amsmath package:
+\begin{equation*}
+    \sqrt{x^2+1}
+\end{equation*}
+
+% manual newline
+
+I will start the third paragraph and then add \verb`\\`\\ a manual line break which
+causes this text to start on a new line but remains part of the same paragraph.
+Alternatively, I can use the \verb|\newline|\newline command to start a new
+line, which is also part of the same paragraph.
+
+% Longer documents, irrespective of authoring software, are usually partitioned
+% into parts, chapters, sections, subsections and so forth.
+
+\section{Document Structure}
+
+Collectively, LaTeX document classes provide the following sectioning commands,
+with specific classes each supporting a relevant subset:
+
+\begin{verbatim}
+    \part{part}
+    \chapter{chapter}
+    \section{section}
+    \subsection{subsection}
+    \subsubsection{subsubsection}
+    \paragraph{paragraph}
+    \subparagraph{subparagraph}
+
+In particular, the \part and \chapter commands are only 
+available in the report and book document classes. 
+\end{verbatim}
+
+\section{Tables}
+
+TIP: Creating tables in LaTeX can be time-consuming so you may want to use the
+https://tablesgenerator.com online tool to export LaTeX code for tabulars.
+
+\begin{center} 
+\begin{tabular}{c c c}
+    % alignment: Center, Right, Left
+    % &: alignment symbol
+    % \\: newline
+    cell1 & cell2 & cell3 \\ 
+    cell4 & cell5 & cell6 \\  
+    cell7 & cell8 & cell9    
+\end{tabular} 
+
+% adding borders (rules)
+\begin{tabular}{||c l c r||} 
+    \hline
+    Col1 & Col2 & Col2 & Col3 \\ [0.5ex]    % control extra spacing
+    \hline\hline
+    1 & hola & 87837 & 787 \\ 
+    \hline
+    2 & mundo & 78 & 5415 \\
+    \hline
+    % 3 & 世界、 & 778 & 7507 \\
+    % \hline
+    % 4 & こんにちは & 18744 & 7560 \\
+    % \hline
+    5 & hello world! & 788 & 6344 \\ [1ex] 
+    \hline
+\end{tabular}
+\end{center}
+
+% To add captions, labels, and references use the Table environment
+
+Table \ref{table:data} shows how to add a table caption and reference a table.
+\begin{table}[h!]
+\centering
+\begin{tabular}{||c c c c||} 
+ \hline
+ Col1 & Col2 & Col2 & Col3 \\ [0.5ex] 
+ \hline\hline
+ 1 & 6 & 87837 & 787 \\ 
+ 2 & 7 & 78 & 5415 \\
+ 3 & 545 & 778 & 7507 \\
+ 4 & 545 & 18744 & 7560 \\
+ 5 & 88 & 788 & 6344 \\ [1ex] 
+ \hline
+\end{tabular}
+\caption{Table to test captions and labels.}
+\label{table:data}
+\end{table}
+
+\section{Finding and using LaTeX packages}
+
+Documentation (in pdf format) in
+\begin{verbatim}
+~/code/tex-live-native/build/texmf-dist/doc/latex
+\end{verbatim}
+
+\LaTeX packages usually have ".sty" extension.
+
+Packages are distributed through the Comprehensive TeX Archive Network 
+(https://www.ctan.org/), usually referred to as CTAN.
+
+Once per year a (large) subset of packages hosted on CTAN, plus LaTeX-related
+fonts and other software, is collated and distributed as a system called TeX
+Live (https://tug.org/texlive/), which can be used to install your own (local)
+LaTeX setup.
+
+Overleaf (https://www.overleaf.com) makes available thousands of templates in
+their gallery (https://www.overleaf.com/gallery).
+
+Some nice packages like https://ctan.org/pkg/igo?lang=en are hosted on CTAN
+but not distributed by TeX Live due to a variety of reasons: perhaps a package
+is obsolete, has licensing problems, is extremely new (recently uploaded) or has
+platform dependencies, such as working on Windows but not Linux. 
+
+\end{document}
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