Here are the Code examples of this chapter. You can compile them online right on this web page by pressing the Typeset / Compile button. You can also edit them for testing, and compile again.
For a better view with the online compiler, I sometimes use \documentclass[border=10pt]{standalone} instead of \documentclass{article}. Instead of having a big letter/A4 page, the standalone class crops the paper to see just the visible text without an empty rest of a page.
Any question about a code example? Post it on LaTeX.org, I will answer. As forum admin I read every single question there. (profile link).
Using tab stops to write in columns
\documentclass{article}
\begin{document}
\begin{tabbing}
\emph{Info:} \= Software \= : \= \LaTeX \\
\> Author \> : \> Leslie Lamport \\
\> Website \> : \> www.latex-project.org
\end{tabbing}
\end{document}

Figure 6.1
Undesired overlapping aligned text
\documentclass{article}
\newcommand{\head}[1]{\textbf{#1}}
\begin{document}
\begin{tabbing}
\= \head{Command} \= \head{Declaration} \= \head{Example}\\
\> \verb|\textrm{...}| \> \verb|\rmfamily| \> \rmfamily text\\
\> \verb|\textsf{...}| \> \verb|\sffamily| \> \sffamily text\\
\> \verb|\texttt{...}| \> \verb|\ttfamily| \> \ttfamily text
\end{tabbing}
\end{document}

Figure 6.2
Corrected aligned text
\documentclass{article}
\newcommand{\head}[1]{\textbf{#1}}
\begin{document}
\begin{tabbing}
\= \verb|\textrm{...}| \= \head{Declaration} \=
\head{Example}\kill
\> \head{Command} \> \head{Declaration} \> \head{Example}\\
\> \verb|\textrm{...}| \> \verb|\rmfamily| \> \rmfamily text\\
\> \verb|\textsf{...}| \> \verb|\sffamily| \> \sffamily text\\
\> \verb|\texttt{...}| \> \verb|\ttfamily| \> \ttfamily text
\end{tabbing}
\end{document}

Figure 6.3
Typesetting tables
\documentclass[border=10pt]{standalone}
\newcommand{\head}[1]{\textnormal{\textbf{#1}}}
\begin{document}
\begin{tabular}{ccc} \hline
\head{Command} & \head{Declaration} & \head{Output}\\
\hline
\verb|\textrm| & \verb|\rmfamily| & \rmfamily Example text\\
\verb|\textsf| & \verb|\sffamily| & \sffamily Example text\\
\verb|\texttt| & \verb|\ttfamily| & \ttfamily Example text\\
\hline
\end{tabular}
\end{document}

Figure 6.4
Understanding formatting arguments
\documentclass[border=10pt]{standalone}
\newcommand{\head}[1]{\textnormal{\textbf{#1}}}
\begin{document}
\begin{tabular}{|l|c|r|p{1.7cm}|}
\hline
left & centered & right & a fully justified paragraph cell\\
\hline
l & c & r & p\\
\hline
\end{tabular}
\end{document}

Figure 6.5
A table with different vertical alignments
\documentclass[border=10pt]{standalone}
\usepackage{array}
\begin{document}
\begin{tabular}{@{}lp{1.2cm}m{1.2cm}b{1.2cm}@{}}
\hline
baseline & aligned at the top & aligned at the middle
& aligned at the bottom\\
\hline
\end{tabular}
\end{document}

Figure 6.6
Increasing the row height
\documentclass[border=10pt]{standalone}
\usepackage{array}
\setlength{\extrarowheight}{4pt}
\begin{document}
\begin{tabular}{@{}>{\itshape}ll!{:}l<{.}@{}}
\hline
Info: & Software & \LaTeX\\
& Author & Leslie Lamport\\
& Website & www.latex-project.org\\
\hline
\end{tabular}
\end{document}

Figure 6.7
Beautifying tables
\documentclass[border=10pt]{standalone}
\usepackage{booktabs}
\newcommand{\head}[1]{\textnormal{\textbf{#1}}}
\begin{document}
\begin{tabular}{ccc}
\toprule[1.5pt]
\head{Command} & \head{Declaration} & \head{Output}\\
\midrule
\verb|\textrm| & \verb|\rmfamily| & \rmfamily Example text\\
\verb|\textsf| & \verb|\sffamily| & \sffamily Example text\\
\verb|\texttt| & \verb|\ttfamily| & \ttfamily Example text\\
\bottomrule[1.5pt]
\end{tabular}
\end{document}

Figure 6.8
Spanning entries over multiple columns
\documentclass[border=10pt]{standalone}
\usepackage{booktabs}
\newcommand{\head}[1]{\textnormal{\textbf{#1}}}
\begin{document}
\begin{tabular}{@{}*{3}l@{}}
\toprule[1.5pt]
\multicolumn{2}{c}{\head{Input}} &
\multicolumn{1}{c}{\head{Output}}\\
\head{Command} & \head{Declaration} & \\
\cmidrule(r){1-2}\cmidrule(l){3-3}
\verb|\textrm| & \verb|\rmfamily| & \rmfamily Example text\\
\verb|\textsf| & \verb|\sffamily| & \sffamily Example text\\
\verb|\texttt| & \verb|\ttfamily| & \ttfamily Example text\\
\bottomrule[1.5pt]
\end{tabular}
\end{document}

Figure 6.9
Inserting code column-wise
\documentclass[border=10pt]{standalone}
\usepackage{array}
\usepackage{booktabs}
\newcommand{\head}[1]{\textnormal{\textbf{#1}}}
\newcommand{\normal}[1]{\multicolumn{1}{l}{#1}}
\begin{document}
\begin{tabular}{@{}l*{2}{>{\ttfamily\textbackslash}l}l%
<{Example text}@{}}
\toprule[1.5pt]
& \multicolumn{2}{c}{\head{Input}} &
\multicolumn{1}{c}{\head{Output}}\\
& \normal{\head{Command}} & \normal{\head{Declaration}}
& \normal{}\\
\cmidrule(lr){2-3}\cmidrule(l){4-4}
Family & textrm & rmfamily & \rmfamily\\
& textsf & sffamily & \sffamily\\
& texttt & ttfamily & \ttfamily\\
\bottomrule[1.5pt]
\end{tabular}
\end{document}

Figure 6.10
Spanning entries over multiple rows
\documentclass[border=10pt]{standalone}
\usepackage{array}
\usepackage{booktabs}
\usepackage{multirow}
\newcommand{\head}[1]{\textnormal{\textbf{#1}}}
\newcommand{\normal}[1]{\multicolumn{1}{l}{#1}}
\begin{document}
\begin{tabular}{@{}l*{2}{>{\textbackslash\ttfamily}l}l%
<{Example text}@{}}
\toprule[1.5pt]
& \multicolumn{2}{c}{\head{Input}} &
\multicolumn{1}{c}{\head{Output}}\\
& \normal{\head{Command}} & \normal{\head{Declaration}}
& \normal{}\\
\cmidrule(lr){2-3}\cmidrule(l){4-4}
\multirow{3}{*}{Family} & textrm & rmfamily & \rmfamily\\
& textsf & sffamily & \sffamily\\
& texttt & ttfamily & \ttfamily\\
\bottomrule[1.5pt]
\end{tabular}
\end{document}

Figure 6.11
Adding captions to tables
\documentclass{article}
\usepackage{array}
\usepackage{booktabs}
\usepackage{multirow}
\newcommand{\head}[1]{\textnormal{\textbf{#1}}}
\newcommand{\normal}[1]{\multicolumn{1}{l}{#1}}
\begin{document}
\begin{table}
\centering
\begin{tabular}{@{}l*{2}{>{\textbackslash\ttfamily}l}%
l<{Example text}l@{}}
\toprule[1.5pt]
& \multicolumn{2}{c}{\head{Input}}
& \multicolumn{2}{c}{\head{Output}}\\
& \normal{\head{Command}} & \normal{\head{Declaration}}
& \normal{\head{Single use}} & \head{Combined}\\
\cmidrule(lr){2-3}\cmidrule(l){4-5}
\multirow{3}{*}{Family} & textrm & rmfamily & \rmfamily & \\
& textsf & sffamily & \sffamily & \\
& texttt & ttfamily & \ttfamily & \\
\cmidrule(lr){2-3}\cmidrule(lr){4-4}
\multirow{2}{1.1cm}{Weight} & textbf & bfseries & \bfseries
& \multirow{2}{1.8cm}{\sffamily\bfseries Bold and
sans-serif}\\
& textmd & mdseries & \mdseries & \\
\cmidrule(lr){2-3}\cmidrule(lr){4-4}
\multirow{4}{*}{Shape} & textit & itshape & \itshape & \\
& textsl & slshape & \slshape &
\multirow{2}{1.8cm}{\sffamily\slshape Slanted and
sans-serif}\\
& textsc & scshape & \scshape & \\
& textup & upshape & \upshape & \\
\cmidrule(lr){2-3}\cmidrule(lr){4-4}
Default & textnormal & normalfont & \normalfont & \\
\bottomrule[1.5pt]
\end{tabular}
\caption{\LaTeX\ font selection}
\end{table}
\end{document}

Figure 6.12
This code is available on Github. It is licensed under the MIT License, a short and simple permissive license with conditions only requiring preservation of copyright and license notices.
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