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• Some LaTex related knowledges.
• http://tex.stackexchange.com/questions/101593/empty-space-after-adding-an-image, prevent space after adding image.
• The problem.

\begin{figure}[ht]
  \begin{center}
    \includegraphics[width=9cm,height=5.5cm]{example-image-a}
  \end{center}
  \begin{center}
    \caption[ddd]{ddd}
  \end{center}
\end{figure}

• Here is the solution.

\begin{figure}[ht]
  \centering
  \includegraphics[width=9cm,height=5.5cm]{example-image-a}
  \caption[ddd ]{ ddd }
\end{figure}

• There was a problem which my LaTex document could not handle \chapter{}.
• It was because \chapter{} is only for \documentclass{book} or \documentclass{book}.
• Check this link, http://tex.stackexchange.com/questions/117151/undefined-control-sequence-and-chapter-error
• Basic LaTex setup, https://www.latex-tutorial.com/tutorials/beginners/how-to-use-latex/.
• Screenshot.

• Just add additional line break to add paragraph.
• Example on how to add image, https://www.sharelatex.com/learn/Inserting_Images.

• Example on sectioning your LaTex document, https://www.sharelatex.com/learn/Sections_and_chapters.