documentclass{article}

usepackage{graphicx}

begin{document}

begin{figure}[!tbp]
  centering
  begin{minipage}[b]{0.4textwidth}
    includegraphics[width=textwidth]{flower1.jpg}
    caption{Flower one.}
  end{minipage}
  hfill
  begin{minipage}[b]{0.4textwidth}
    includegraphics[width=textwidth]{flower2.jpg}
    caption{Flower two.}
  end{minipage}
end{figure}

end{document}

documentclass{article}

usepackage{graphicx}
usepackage{subfig}

begin{document}

begin{figure}[!tbp]
  centering
  subfloat[Flower one.]{includegraphics[width=0.4textwidth]{flower1.jpg}label{fig:f1}}
  hfill
  subfloat[Flower two.]{includegraphics[width=0.4textwidth]{flower2.jpg}label{fig:f2}}
  caption{My flowers.}
end{figure}

end{document}

documentclass{article}

usepackage{graphicx}
usepackage{caption}
usepackage{subcaption}

begin{document}

begin{figure}[!tbp]
  begin{subfigure}[b]{0.4textwidth}
    includegraphics[width=textwidth]{flower1.jpg}
    caption{Flower one.}
    label{fig:f1}
  end{subfigure}
  hfill
  begin{subfigure}[b]{0.4textwidth}
    includegraphics[width=textwidth]{flower2.jpg}
    caption{Flower two.}
    label{fig:f2}
  end{subfigure}
  caption{My flowers.}
end{figure}

end{document}

begin{figure}[h]
begin{tabular}{ll}
includegraphics[scale=1]{Figures/Race.png}
&
includegraphics[scale=0.4]{Figures/Bearing.png}
end{tabular}
caption{Left: Diagram of angular contact bearing cite{NBCBearing}.
Right: Disassembled bearing}
label{Fig:Race}
end{figure}

documentclass{article}
usepackage{mwe}% or load ’graphicx’ and ’blindtext’ manually
begin{document}
blindtext
begin{figure}
includegraphics[width=.48linewidth]{example-image-a}hfill
includegraphics[width=.48linewidth]{example-image-b}
caption{MWE to demonstrate how to place to images side-by-side}
end{figure}
blindtext
end{document}