SharePoint Online

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Level 1 What is SharePoint Online? - Beginner Tutorial (3 mins)
good overview


Level 1 How to Create a Document Library in SharePoint Online - Beginner Tutorial (4 mins)
Doc library


Level 1 How to Set up your Team Site in Office 365 for document storage & intranet (8 mins)
this video -- Team Site creation. Document Library. Build list and page，insert webpart; subsite to share with user outside of company.


Level 2
Create a Small Business SharePoint Intranet (14 mins)
The video is very good example of small company's site and sub-sites.