Section 1.1 Introduction to First Chapter
Intro to section, because we will have subsections.
Another paragraph of the introduction.
Subsection 1.1.1 A subsection
Content of the subsection.
More content.
Subsection 1.1.2 Another Subsection
Text with some math: \(\sin(x) = \cos(x)\) only for some values of \(x\text{.}\)
After the last subsection, you might have a conclusion.