How to not show all content at first page.

Hi there, I’m newbie here. I installed Worpress and I’m very impressed with this forum support and script features. However, I would like to ask something. I tried to make every topics at first page to show “some part” of its contents, not “all” content at once. I want to put “read more” at the bottom of every topics and user can read more contents by click there. How to make it?

Regards,
Sxperm