\usepackage{etoolbox}
\patchcmd{\tableofcontents}{\contentsname}{\textbf{Table of Contents}}{}{}
\usepackage{titletoc}

% Make the section numbers bold
\titlecontents{section}
  [0pt] % Left margin
  {\bfseries} % The format for sections
  {\contentslabel{2em}} % Section label (with bold page numbers)
  {} % Content after the label
  {\titlerule*[1pc]{.}\contentspage} % Filler and page number