Why would you modify the Head Markup of a Salesforce Community? [Choose 3]

Universal Containers recently built a Community for their customers. They would like to allow access Of files maintained in their Sharepoint Online with customers. Which Salesforce feature should the Salesforce Admin recommend?

When allowing external users to Create and Edit reports, what important step must your complete first?

Universal Containers needs employees who already have access to Salesforce to get access to a Customer Community they have just launched. The employee Salesforce profiles have been added to the Community.
What should the Salesforce Admin do to give employees access to the Customer Community?

Universal Containers is building a Lightning Community. A few Community pages have numerous Lighting Components which are taking longer to display.
Which step should be taken to improve display time performance of the pages?