Working with Images in LaTeX

% Check file extension
\includegraphics{image.png} % Wrong
\includegraphics{image} % Correct

% Check path
\graphicspath{{./images/}{../figures/}}

% Don't use both width and height unless needed
\includegraphics[width=5cm, height=3cm]{image} % May distort
\includegraphics[width=5cm]{image} % Maintains ratio

% Too strict placement
\begin{figure}[h] % May cause bad spacing
\begin{figure}[htbp] % More flexible

% Image too wide
\includegraphics[width=\textwidth]{image}
% Better: leave some margin
\includegraphics[width=0.95\textwidth]{image}