\documentclass[10pt,a4paper]{article}

% Packages
\usepackage{fancyhdr}           % For header and footer
\usepackage{multicol}           % Allows multicols in tables
\usepackage{tabularx}           % Intelligent column widths
\usepackage{tabulary}           % Used in header and footer
\usepackage{hhline}             % Border under tables
\usepackage{graphicx}           % For images
\usepackage{xcolor}             % For hex colours
%\usepackage[utf8x]{inputenc}    % For unicode character support
\usepackage[T1]{fontenc}        % Without this we get weird character replacements
\usepackage{colortbl}           % For coloured tables
\usepackage{setspace}           % For line height
\usepackage{lastpage}           % Needed for total page number
\usepackage{seqsplit}           % Splits long words.
%\usepackage{opensans}          % Can't make this work so far. Shame. Would be lovely.
\usepackage[normalem]{ulem}     % For underlining links
% Most of the following are not required for the majority
% of cheat sheets but are needed for some symbol support.
\usepackage{amsmath}            % Symbols
\usepackage{MnSymbol}           % Symbols
\usepackage{wasysym}            % Symbols
%\usepackage[english,german,french,spanish,italian]{babel}              % Languages

% Document Info
\author{bdc}
\pdfinfo{
  /Title (wireless-presentation.pdf)
  /Creator (Cheatography)
  /Author (bdc)
  /Subject (Wireless Presentation Cheat Sheet)
}

% Lengths and widths
\addtolength{\textwidth}{6cm}
\addtolength{\textheight}{-1cm}
\addtolength{\hoffset}{-3cm}
\addtolength{\voffset}{-2cm}
\setlength{\tabcolsep}{0.2cm} % Space between columns
\setlength{\headsep}{-12pt} % Reduce space between header and content
\setlength{\headheight}{85pt} % If less, LaTeX automatically increases it
\renewcommand{\footrulewidth}{0pt} % Remove footer line
\renewcommand{\headrulewidth}{0pt} % Remove header line
\renewcommand{\seqinsert}{\ifmmode\allowbreak\else\-\fi} % Hyphens in seqsplit
% This two commands together give roughly
% the right line height in the tables
\renewcommand{\arraystretch}{1.3}
\onehalfspacing

% Commands
\newcommand{\SetRowColor}[1]{\noalign{\gdef\RowColorName{#1}}\rowcolor{\RowColorName}} % Shortcut for row colour
\newcommand{\mymulticolumn}[3]{\multicolumn{#1}{>{\columncolor{\RowColorName}}#2}{#3}} % For coloured multi-cols
\newcolumntype{x}[1]{>{\raggedright}p{#1}} % New column types for ragged-right paragraph columns
\newcommand{\tn}{\tabularnewline} % Required as custom column type in use

% Font and Colours
\definecolor{HeadBackground}{HTML}{333333}
\definecolor{FootBackground}{HTML}{666666}
\definecolor{TextColor}{HTML}{333333}
\definecolor{DarkBackground}{HTML}{A167A3}
\definecolor{LightBackground}{HTML}{F9F5F9}
\renewcommand{\familydefault}{\sfdefault}
\color{TextColor}

% Header and Footer
\pagestyle{fancy}
\fancyhead{} % Set header to blank
\fancyfoot{} % Set footer to blank
\fancyhead[L]{
\noindent
\begin{multicols}{3}
\begin{tabulary}{5.8cm}{C}
    \SetRowColor{DarkBackground}
    \vspace{-7pt}
    {\parbox{\dimexpr\textwidth-2\fboxsep\relax}{\noindent
        \hspace*{-6pt}\includegraphics[width=5.8cm]{/web/www.cheatography.com/public/images/cheatography_logo.pdf}}
    }
\end{tabulary}
\columnbreak
\begin{tabulary}{11cm}{L}
    \vspace{-2pt}\large{\bf{\textcolor{DarkBackground}{\textrm{Wireless Presentation Cheat Sheet}}}} \\
    \normalsize{by \textcolor{DarkBackground}{bdc} via \textcolor{DarkBackground}{\uline{cheatography.com/197890/cs/41807/}}}
\end{tabulary}
\end{multicols}}

\fancyfoot[L]{ \footnotesize
\noindent
\begin{multicols}{3}
\begin{tabulary}{5.8cm}{LL}
  \SetRowColor{FootBackground}
  \mymulticolumn{2}{p{5.377cm}}{\bf\textcolor{white}{Cheatographer}}  \\
  \vspace{-2pt}bdc \\
  \uline{cheatography.com/bdc} \\
  \end{tabulary}
\vfill
\columnbreak
\begin{tabulary}{5.8cm}{L}
  \SetRowColor{FootBackground}
  \mymulticolumn{1}{p{5.377cm}}{\bf\textcolor{white}{Cheat Sheet}}  \\
   \vspace{-2pt}Not Yet Published.\\
   Updated 20th December, 2023.\\
   Page {\thepage} of \pageref{LastPage}.
\end{tabulary}
\vfill
\columnbreak
\begin{tabulary}{5.8cm}{L}
  \SetRowColor{FootBackground}
  \mymulticolumn{1}{p{5.377cm}}{\bf\textcolor{white}{Sponsor}}  \\
  \SetRowColor{white}
  \vspace{-5pt}
  %\includegraphics[width=48px,height=48px]{dave.jpeg}
  Measure your website readability!\\
  www.readability-score.com
\end{tabulary}
\end{multicols}}




\begin{document}
\raggedright
\raggedcolumns

% Set font size to small. Switch to any value
% from this page to resize cheat sheet text:
% www.emerson.emory.edu/services/latex/latex_169.html
\footnotesize % Small font.

\begin{multicols*}{4}

\begin{tabularx}{3.833cm}{x{1.51052 cm} x{1.92248 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{3.833cm}}{\bf\textcolor{white}{I. Introduction to Wireless Technologies}}  \tn
% Row 0
\SetRowColor{LightBackground}
A. Evolution Of Wireless & Wireless has evolved significantly from 1G to 5G \tn 
% Row Count 3 (+ 3)
% Row 1
\SetRowColor{white}
B. Importance in the Modern Era & Real-Time Data Exchange Technological Evolution Enhanced Productivity Ubiquitous Wi-Fi Enhanced Productivity Global Internet Connectivity \tn 
% Row Count 10 (+ 7)
% Row 2
\SetRowColor{LightBackground}
C. Key Challenges & Attenuation or Signal Loss Movement/ Time variance Multipath  Fading/Interference Reach \tn 
% Row Count 14 (+ 4)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{3.833cm}{x{0.84924 cm} x{1.09188 cm} x{1.09188 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{3}{x{3.833cm}}{\bf\textcolor{white}{II. Fundamentals of Wireless}}  \tn
% Row 0
\SetRowColor{LightBackground}
A. Wireless \seqsplit{Transmission} Basics & The \seqsplit{electromagnetic} spectrum enables mobile communication through invisible waves. &  \tn 
% Row Count 6 (+ 6)
% Row 1
\SetRowColor{white}
B. Types of wireless & Infrared\textbackslash{}Radio Waves\textbackslash{}Microwaves & Short-range\textbackslash{}Long-distance\textbackslash{}Line-of-sight \tn 
% Row Count 9 (+ 3)
% Row 2
\SetRowColor{LightBackground}
C. Wireless Network Components & Transmitter and Receiver\textbackslash{}Antennas and Signal Propagation\textbackslash{}Modulation Techniques & The transmitter converts information into signals \&The receiver captures\textbackslash{}Propagate through ground-wave, sky-wave, and line-of-sight modes\textbackslash{}Transmitting data wirelessly in an interpretable form for receivers. \tn 
% Row Count 24 (+ 15)
\hhline{>{\arrayrulecolor{DarkBackground}}---}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{3.833cm}{p{0.7899 cm} p{0.7899 cm} p{0.2633 cm} p{0.7899 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{4}{x{3.833cm}}{\bf\textcolor{white}{III. Wireless Network Architectures}}  \tn
% Row 0
\SetRowColor{LightBackground}
A. \seqsplit{Infrastructure} Mode vs. Ad-hoc Mode & Between devices \textbackslash{}Through an access point & slower\textbackslash{}faster & Range restricted to individual device range\textbackslash{}Range determined by access points \tn 
% Row Count 7 (+ 7)
% Row 1
\SetRowColor{white}
B. Mesh Networks: Enhancing \seqsplit{Connectivity} & provide better coverage, faster speeds, and easy setup. &  &  \tn 
% Row Count 12 (+ 5)
% Row 2
\SetRowColor{LightBackground}
C. Cellular Networks and their Evolution & 1G, 2G ,3G ,4G, 5G &  &  \tn 
% Row Count 16 (+ 4)
\hhline{>{\arrayrulecolor{DarkBackground}}----}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{3.833cm}{x{0.87957 cm} x{1.09188 cm} x{1.06155 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{3}{x{3.833cm}}{\bf\textcolor{white}{IV. Wireless Standards and Protocols}}  \tn
% Row 0
\SetRowColor{LightBackground}
A. IEEE 802.11 (Wi-Fi) & Is a standard that governs wireless communication in local area, allowing devices to connect and exchange data . & WEP, WPA, WPA2, and WPA3 are crucial for securing Wi-Fi networks \tn 
% Row Count 8 (+ 8)
% Row 1
\SetRowColor{white}
B. Bluetooth and its \seqsplit{Applications} & Mobile Phone Connectivity, Wireless Speaker , File Transfer &  \tn 
% Row Count 13 (+ 5)
% Row 2
\SetRowColor{LightBackground}
C. 5G Technology & Benefits: Faster data transmission, real-time interactions, improved connectivity. &  \tn 
% Row Count 19 (+ 6)
\hhline{>{\arrayrulecolor{DarkBackground}}---}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{3.833cm}{x{1.33887 cm} x{2.09413 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{3.833cm}}{\bf\textcolor{white}{V. Security in Wireless Networks}}  \tn
% Row 0
\SetRowColor{LightBackground}
A. Types of Risks & Piggybacking , Wardriving, Evil Twin Attacks, Wireless Sniffing,  Unauthorized Computer Access,  Shoulder Surfing, Theft of Mobile Devices \tn 
% Row Count 6 (+ 6)
% Row 1
\SetRowColor{white}
B. Types of minimize Risks & Change Default Passwords , Restrict Access , Connect via VPN Check Security Options,  Update Access Point Software,  Use File Sharing Cautiously,  Install Firewall,  Change Default Passwords,  Encrypt Data,  Maintain Antivirus Software,  Protect SSID, \tn 
% Row Count 17 (+ 11)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{3.833cm}{x{0.84924 cm} x{1.09188 cm} x{1.09188 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{3}{x{3.833cm}}{\bf\textcolor{white}{VI. Emerging Trends in Wireless Technology}}  \tn
% Row 0
\SetRowColor{LightBackground}
A. Wireless \seqsplit{Connectivity} in IoT & The impact of the wireless in IOT on our lives: & Increased Efficiency , Enhanced Convenience ,  Enhanced Convenience , Personalized Experiences \tn 
% Row Count 7 (+ 7)
% Row 1
\SetRowColor{white}
B. Edge Computing & dge computing in wireless networks represents a paradigm shift in how data is processed and services are delivered, bringing efficiency, speed, and new capabilities to various fields. &  \tn 
% Row Count 21 (+ 14)
% Row 2
\SetRowColor{LightBackground}
C. Artificial \seqsplit{Intelligence} & it helps in  addressing issues with Wi-Fi radios, client connectivity, and potential security threats. &  \tn 
% Row Count 29 (+ 8)
\hhline{>{\arrayrulecolor{DarkBackground}}---}
\end{tabularx}
\par\addvspace{1.3em}


% That's all folks
\end{multicols*}

\end{document}