1. You should check out a document only if you want to make sure that no one else can change it until you check it back in. If you want to collaborate on a document, do not check it out. http://office.microsoft.com/en-us/sharepoint-server-help/check-out-check-in-or-discard-changes-to-files-in-a-site-library-HA101849698.aspx
2. If you are deleting something in SharePoint 2010 and you do not see a message that states the deleted item is being sent to the Recycle Bin, neither you nor your IT department will be able to restore it once it has been deleted.
3. Don’t know the first letter of someone’s name? Try a wild card search by substituting the unknown letter with an asterisk (*). http://office.microsoft.com/en-us/sharepoint-server-help/search-for-content-HA010378166.aspx
4. Need to add an event to your calendar? Just point to the date on the calendar, and then click Add.
5. A SharePoint calendar enables you to work with multiple Exchange and SharePoint calendars at the same time. A view for a calendar can display a maximum of ten calendars. http://office.microsoft.com/en-us/sharepoint-server-help/work-with-multiple-exchange-and-sharepoint-calendars-in-one-sharepoint-calendar-HA101777171.aspx?CTT=1
6. Having trouble deciding what kind of site you need to create? Check out these short videos to help you make the right decisions. http://office.microsoft.com/en-us/sharepoint-server-help/a-preview-of-the-sharepoint-server-2010-site-templates-HA101907564.aspx
7. Want to see just your tasks in a tasks list? In the Change View box (List tab), click My Tasks.
8. If you want to open a SharePoint site in a new window press Shift, and then click the link in the quick-launch bar located on the left side of the page.