Add get_posts within a page with other content

Hello,

I have been reading the Codex’ get_posts section and a number of threads on this forum, but I am still incredibly lost.

I wish to insert a list of posts at the end of a page that has some other content above such list.

The questions are: (1) Do I set the parameters of get_posts (by X category, or post ID, etc) within that code, or when I call it later from the page? (2) If parameters are inserted within the code, how do I make different kinds of callings throughout the site? (2) How do I call the function from the page?

Thank you so very much in advance! I have spent a few days trying to understand how this works now and I am getting desperate ??