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\usepackage{fancyhdr}
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 %%%%%%%%%%%%%  THEOREMS  %%%%%%%%%%%%%%%%%
% Let's define some theorem environments
% To use later in the paper
\theoremstyle{plain} % other options: definition, remark
\newtheorem{theorem}{Theorem}
\newtheorem{lemma}[theorem]{Lemma}
% By including [theorem], the lemma follows the numbering of theorem
% e.g. Thm 1, Lemma 2, Thm 3, Thm 4, \dots
\theoremstyle{definition}
\newtheorem*{definition}{Definition} % the star prevents numbering

% Remarks
\theoremstyle{remark}
\newtheorem{remark}{Remark}

\pagestyle{fancy}
\fancyhf{}
\fancyhead[LE,RO]{Wong Jun Hui, Ryan}
\fancyhead[RE,LO]{Notes from MITOCW18.02SC}
\fancyfoot[CE,CO]{\leftmark}
\fancyfoot[LE,RO]{\thepage}
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{\fontfamily{lmss}\selectfont
\title{MIT OCW 18.02SC: Multivariable Calculus \\ Notes}
\author{Wong Jun Hui, Ryan \\ rwjhwong@icloud.com}}

\date{}                         % Activate to display a given date or no date

\begin{document}
\maketitle
\tableofcontents
\newpage
\section{Vectors and Matrices}
\subsection{Vectors, Determinants and Planes}
\subsubsection{Day idk what}