Which WordPress hook is used to do this….?

Hi,

I would like to insert php code/ html code into the top or bottom of an entry of a post or page or custom post type.

Eg insert php code after the post title, or before content, or after content.

Similar to eg how a Sharing plugin may have an option to show sharing icons at the top or bottom of the content of a post.

I have looked at:

https://developer.wordpress.org/reference/hooks/

which lists 81 pages of various hooks.

I have not been able to find the hooks I am looking for. (Probably on page 67 when I went only up to page 66) lol

Any help is mucho appreciated……