\documentclass{article}
\usepackage[english]{babel}			
\usepackage[utf8]{inputenc}
\usepackage{geometry}
\usepackage[T1]{fontenc}
\usepackage{lmodern}
\usepackage{tikz-cd}

\usepackage{graphicx}
\usepackage[colorlinks = true,
linkcolor = blue,
urlcolor  = blue,
citecolor = blue,
anchorcolor = blue]{hyperref}

\newcommand{\MYhref}[3][blue]{\href{#2}{\color{#1}{#3}}}%

\usepackage{amsmath}
\usepackage{amssymb}			
\usepackage{amsfonts}
\usepackage{amsthm}
\usepackage{mathtools}

\usepackage{tikz}
\usetikzlibrary{matrix}
\usetikzlibrary{fit}
\usetikzlibrary{backgrounds}
\usetikzlibrary{arrows}
\usetikzlibrary{shapes}


\theoremstyle{plain}
\newtheorem{thm}{Theorem}[section]
\newtheorem{lemm}[thm]{Lemma}
\newtheorem{prop}[thm]{Proposition} 
\newtheorem{theo}[thm]{Theorem}
\newtheorem{Cor}[thm]{Corollary}
\newtheorem{thm-defi}[thm]{Theorem-Definition}

\theoremstyle{definition}
\newtheorem{defi}[thm]{Definition}
\newtheorem{rem}[thm]{Remark}
\newtheorem{ex}[thm]{Example}
\newtheorem{Conc}[thm]{Conclusion}
\newtheorem{nota}[thm]{Notation}
\newtheorem{exer}[thm]{Exercise}
\newtheorem{soln}[thm]{Solution}
\usepackage{fancyhdr}

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 
\begin{document}
\pagestyle{fancy}
\renewcommand{\footrulewidth}{0.4pt}
\fancyhead{}
\fancyhead[RO,RE]{$p-$adic numbers}
\fancyhead[LO,LE]{Your name}%This is the header
\fancyfoot{}
\fancyfoot[LO]{Handout} %This is the place for footnote

\begin{center}
	\Huge{\textbf{Talk \#: Title}}%Title spot
\end{center}
	\begin{minipage}{0.45\textwidth}%This helps you write on one half of a page and may be helps you conserve some space
	\section{Sample section}%\section{} creates the section you want
			In this talk, we would like to study blah blah blah... They are defined as 
			\begin{defi}%\begin{defi}..\end{defi} creates a definition
				... 
			\end{defi}
		We prove the following result
		\begin{thm}%this is for creating theorems
			...
		\end{thm}
		
		
		
				
	\end{minipage}%
	\hfill
	\begin{minipage}{0.45\textwidth}
		Blah ....
\section{Sample section II}

\begin{defi}
	....
\end{defi}		

\begin{thm}
	 ...
\end{thm}

\begin{proof}
..... The proof follows then from \cite[Prop. 3.13]{Gou} %\cite helps you cite from the references belows 
\end{proof}
	\end{minipage}%



\begin{thebibliography}{widest-label} % References are listed here
	
	\bibitem[Gou]{Gou}%You can add more refernces by \bibitem command
	Fernando Q. Gouv\^{e}a:
	\emph{p-adic Numbers}.
	
	
\end{thebibliography}

\end{document}