Summary View on main WP page

I am trying to only show a summary of thhe posts on the main page, with a “Read More..” link at the bottom of each. I searched for my answer, and can’t seem to find it. I am using the default theme without a header image, and a custom menu (don’t know if it matters). Aslo, I only have 2 posts so far, and don’t know if that affects it…