Sitecore caching and varying

This is my first time with开发者_如何学C Sitecore caching and I haven't been able to find a good guide about how to use the various varying options in Sitecore. I want to know how each is different, how they differ in regards to what they cache and also in what to use in a typical scenario?

Any inputs are appreciated. Thanks

I wrote this guide a while back, it should give you a pretty good overview: http://learnsitecore.cmsuniverse.net/en/Developers/Articles/2009/07/CachingOverview.aspx

Also Sitecore Australia has this video you might want to watch: http://sitecoreaustralia.wordpress.com/2010/06/28/cache-webinar-recording/

Edit: The above blog seem to have closed. Instead you can download the webinar here

Cheers Jens