\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{Bayan (Bayan.A)}
\pdfinfo{
  /Title (professional-issues-in-it.pdf)
  /Creator (Cheatography)
  /Author (Bayan (Bayan.A))
  /Subject (Professional Issues in IT Cheat Sheet)
}

% Lengths and widths
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\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
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\definecolor{FootBackground}{HTML}{666666}
\definecolor{TextColor}{HTML}{333333}
\definecolor{DarkBackground}{HTML}{0B00A3}
\definecolor{LightBackground}{HTML}{F7F7FC}
\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{Professional Issues in IT Cheat Sheet}}}} \\
    \normalsize{by \textcolor{DarkBackground}{Bayan (Bayan.A)} via \textcolor{DarkBackground}{\uline{cheatography.com/122738/cs/31569/}}}
\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}Bayan (Bayan.A) \\
  \uline{cheatography.com/bayan-a} \\
  \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 7th April, 2022.\\
   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*}{3}

\begin{tabularx}{5.377cm}{x{2.28942 cm} x{2.68758 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{What is a system?}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{5.377cm}}{a set of things working together as parts of a mechanism or an interconnecting network; an assembly of parts or components existing together in an organised way.} \tn 
% Row Count 4 (+ 4)
% Row 1
\SetRowColor{white}
\mymulticolumn{2}{x{5.377cm}}{a complex whole: for example, the railway system, the human body} \tn 
% Row Count 6 (+ 2)
% Row 2
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{5.377cm}}{a set of principles or procedures according to which something is done} \tn 
% Row Count 8 (+ 2)
% Row 3
\SetRowColor{white}
\mymulticolumn{2}{x{5.377cm}}{generally have INPUTS, OUTPUTS, PROCESSES, BOUNDARIES} \tn 
% Row Count 10 (+ 2)
% Row 4
\SetRowColor{LightBackground}
can be made up of many sub-systems & loosely or tightly coupled \tn 
% Row Count 12 (+ 2)
% Row 5
\SetRowColor{white}
 & outputs from one or more sub-systems can provide inputs to other systems \tn 
% Row Count 16 (+ 4)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{x{1.4931 cm} x{3.4839 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{What is Information?}}  \tn
% Row 0
\SetRowColor{LightBackground}
Signs/  Signals & An action, impulse, event, non-event that can be detected, deduced, derived \tn 
% Row Count 3 (+ 3)
% Row 1
\SetRowColor{white}
Data & "A description of something that allows it to be recorded, analysed and reorganised." \tn 
% Row Count 7 (+ 4)
% Row 2
\SetRowColor{LightBackground}
Information & Data that has been cleaned, processed, stored, organised, transmitted… \tn 
% Row Count 10 (+ 3)
% Row 3
\SetRowColor{white}
Knowledge & …information that has been analysed and interpreted \tn 
% Row Count 12 (+ 2)
% Row 4
\SetRowColor{LightBackground}
 & … information that has been refined by experience, education, familiarity… \tn 
% Row Count 15 (+ 3)
% Row 5
\SetRowColor{white}
Wisdom & the quality of having experience, knowledge \& good judgement \tn 
% Row Count 18 (+ 3)
% Row 6
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{5.377cm}}{σσ  is an instance of information, understood as semantic content, if and only if:  (GDI.1) 	σσ consists of one or more data; (GDI.2) 	the data \seqsplit{in σσ are well-formed;} (GDI.3) 	the well-formed data \seqsplit{in σσ are meaningful}.} \tn 
% Row Count 23 (+ 5)
% Row 7
\SetRowColor{white}
'data' & defined as 'the stuff of which information is made'. \tn 
% Row Count 25 (+ 2)
% Row 8
\SetRowColor{LightBackground}
\seqsplit{'well-formed'} & means that the data are clustered together correctly, according to the rules (syntax) that govern the chosen system, code or language being analysed. \tn 
% Row Count 31 (+ 6)
\end{tabularx}
\par\addvspace{1.3em}

\vfill
\columnbreak
\begin{tabularx}{5.377cm}{x{1.4931 cm} x{3.4839 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{What is Information? (cont)}}  \tn
% Row 9
\SetRowColor{LightBackground}
\seqsplit{'meaningful'} & means that the data must comply with the meanings (semantics) of the chosen system, code or language in question. \tn 
% Row Count 5 (+ 5)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}


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

\end{document}