Note: For any technical document (paper/article, report, thesis dissertation), simple and formal language style must be followed.
The sectioning of the article (paper) is mostly logical, governed by the subject matter and the author's intention of the manner of its exposition.
However, in case you find a section tends to be unduly long, explore once whether it can be split into two or more logically divided sections. If that does not turn out as proper, then use subsections.
2.1 (?) The first subsection
Here you start building the subject matter of your paper.
2.2 The second subsection
Continue.
2.3 The third subsection
......... and so on.