Recommended Structure
input vs include
\input{file}inserts content inline.\include{file}starts on a new page and works with\includeonly.
main.tex
Faster Draft Builds
includeonly.tex
Organize large LaTeX projects with input, include, and subfiles for theses, books, and reports.
\input{file} inserts content inline.\include{file} starts on a new page and works with \includeonly.