Hi again,
There is some information on includelets in our documentation pages here.
I admit that the documentation isn't always great or totally up to date so if it doesn't help then please continue to ask questions! :-)
Essentially, if you go to the Layout tab of a page in the CMS, then you can add bits of content into the page - these bits of content are called Includelets.
It's Includelets that currently provide the "upcoming events" and "latest news" entries on the front page of sites. You can pick them up and move them around, or reconfigure them so that they show different bits of content.
If it's lists of content from on your site that you want (e.g., links to latest news articles etc) then the includelets to look at would be "Latest News", and "Filtered Item List". The latter is most powerful and has loads of options. The former is relatively simple and shows links to recently postedd news articles.
Regarding videos - I beleve YouTube limits to 15 minutes per film, which is enough for most needs!
Thanks
Joe - Voice Admin