The Asset Manager function makes it easier to reuse content from your own and other peoples' guides. Before adding any links, widgets or images, you should always check if the link already exists before creating a new one. This avoids duplication and will make updating the guides and gathering statistics much easier for all types of content.
Only by viewing your guide outside of Edit Mode will you see what it really looks like. You can set your guide to Private to be able to preview content which has not been submitted for review.
You may add new pages but please consider the following: