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I'm not sure, I followed a YouTube tutorial. Do you know what I should use instead?

Actually, done it. Thank you for your help!

If I don't include a caption then my image sits under my writing, eg:
\documentclass[11pt]{article}
\usepackage{graphicx}
\title{Trying}
\author{Ksks}
\begin{document}
\maketitle
Hello.
\begin{figure}[!h]
\centering
\includegraphics[scale=0.75]{plot.jpg}
\end{figure}
\end{document}

But when I ...