How can I make a section on my homepage display the content of a certain post?

to locate which template does the homepage: https://codex.www.ads-software.com/Template_Hierarchy

conditional tags to limit the code to the homepage only: https://codex.www.ads-software.com/Conditional_Tags

to get a post: https://codex.www.ads-software.com/Function_Reference/get_post

to get a page: https://codex.www.ads-software.com/Function_Reference/get_page