\documentclass{book}
\usepackage{kantlipsum}

\usepackage{mfirstuc}[=2021-11-22]
\usepackage[toc,nopostdot,acronym]{glossaries}[=2021-11-22]
\usepackage{glossaries-extra}[=2021-11-22]

\begin{document}

\frontmatter
\tableofcontents

\mainmatter
\chapter{First}
\section{One}
\kant[1-5]
\section{Two}
\kant[6-10]
\section{Three}
\kant[11-15]

\end{document}
