A two column article template (slightly opinionated with a bit of preamble creep).
\begin
Discover why 18 million people worldwide trust Overleaf with their work.
%\title{Two column article template by M.A.}
\documentclass[11pt, twocolumn]{article}
\usepackage{authblk}
\makeatletter
\renewcommand{\maketitle}{\bgroup\setlength{\parindent}{0pt}
\begin{flushleft}
\textbf{\@title}
\@author
\end{flushleft}\egroup
}
\makeatother
\title{\Huge Mapping governance networks through hyperlink analysis: What do we really measure? \vspace{0.5cm}}
\author{\Large Mario Angst \normalsize \hspace{0.5cm} Eawag aquatic research, University of Berne}
\date{\today}
\usepackage[showframe=false, margin=.75in]{geometry}
\usepackage{abstract}
\renewcommand{\abstractname}{} % clear the title
\renewcommand{\absnamepos}{empty} % originally center
\usepackage{lipsum}
\usepackage{afterpage}
\renewenvironment{abstract}
{\small
\begin{center}
\bfseries \abstractname\vspace{-.5em}\vspace{0pt}
\end{center}
\list{}{%
\setlength{\leftmargin}{10mm}% <---------- Change margin here
\setlength{\rightmargin}{\leftmargin}%
}%
\item\relax}
{\endlist}
\usepackage[utf8]{inputenc}
%\usepackage{graphicx}
\usepackage{wrapfig}
\usepackage[lofdepth,lotdepth]{subfig}
\usepackage{booktabs}
\usepackage{rotating}
\usepackage{caption}
%\usepackage{subcaption}
%\usepackage[ngerman]{babel}
\usepackage{csquotes}
\usepackage{todonotes}
\usepackage{stfloats}
\usepackage[T1]{fontenc}
\usepackage{textcomp}
\usepackage{times}
\usepackage{framed} %um Boxen zu machen
\usepackage[citestyle=authoryear,
bibstyle=authoryear,
language=auto,
url=false,
backend=bibtex,
doi=false,
isbn=false]{biblatex}
\renewbibmacro*{volume+number+eid}{%
\printfield{volume}%
% \setunit*{\adddot}% DELETED
\setunit*{\addnbspace}% NEW (optional); there's also \addnbthinspace
\printfield{number}%
\setunit{\addcomma\space}%
\printfield{eid}}
\DeclareFieldFormat[article]{number}{\mkbibparens{#1}}
\addbibresource{Mendeley.bib}
\usepackage{setspace}
\onehalfspacing
\setlength{\columnsep}{0.8cm}
\setlength{\parskip}{0em}
\usepackage{color}
\definecolor{black}{gray}{0} % 10% gray
\usepackage[colorlinks=true,linkcolor=black,citecolor=black]{hyperref}
\usepackage{tabularx}
\newcolumntype{b}{X}
\newcolumntype{s}{>{\hsize=.5\hsize}X}
\usepackage{ntheorem}
\newtheorem*{TRQ}{Research Question}
\newtheorem{Hyp}{Hypothesis}
\begin{document}
\twocolumn[
\begin{@twocolumnfalse}
\maketitle
\begin{abstract}
\textit{\lipsum[1]
\bigskip}
\end{abstract}
\end{@twocolumnfalse}
]
First we are citing \textcite{Granovetter1973}.
\lipsum[1]
\begin{Hyp}
A hypothesis is likely to be false if it is longer than this line
\label{hyp:nd_conflictivity}
\end{Hyp}
\lipsum[1]
\begin{table}[ht]
\centering
\begin{tabular}{rrrrrr}
\toprule
text & text & text & text & text & text \\
\midrule
1 & 84 & 46 & 4 & 3 & 5 \\
2 & 67 & 24 & 5 & 1 & 5 \\
3 & 54 & 26 & 4 & 2 & 5 \\
4 & 44 & 16 & 5 & 2 & 5 \\
5 & 53 & 21 & 6 & 2 & 5 \\
\bottomrule
\end{tabular}
\caption{An example single column table}
\label{tab:example}
\end{table}
\lipsum[1]
\begin{figure*}[ht!]
\centering
\includegraphics[width=1\textwidth]{plot.png}
\caption{A two column figure (indicate with figure*)}
\label{fig:example}
\end{figure*}
\lipsum[1]
\printbibliography
\clearpage
\appendix
\renewcommand\thefigure{A\arabic{figure}}
\setcounter{figure}{0}
\section*{Appendix}
Appendix content
\end{document}