You want to install something that you don't know what it's used for? Or you just don't know the command set?
You install subversion with:
sudo apt-get install subversion
The official home page for the subversion project is: here
On that page is the traditional Documentation and FAQ links.
For tutorials, all you have to do is a Google search for "subversion tutorial
A couple links from the previous search:
Also, a link to Ubuntu Community Documentation that describes setting up a subversion server (with apache2):