Where Do I find how to:
Using Jamroom
You might check out the docs:
https://www.jamroom.net/the-jamroom-network/documentation
If there isn't information there that your looking for, let us know, we are constantly adding to the docs.
Cache is something you really should be familiar with. It basically stores information that makes pages load quicker. Basically Clearing or Resetting your cache will allow pages to be rebuilt with the latest data.
Smarty is what Jamroom templates use to add content. Here is a link to the docs for smarty:
http://www.smarty.net/docs/en/
HTML is basic web page coding language. This site is good for learning the basics:
http://www.w3schools.com/
Feel free to post here on the forums if should run into anything that you need help with. That is what it is here for and there are a lot of users willing to lend a hand.
Thanks!