What is a Side Door On a Website?

A side door sometimes called a splash page, doorway to your website, should be keyword rich to a specific search engine.

A side door should have great information and constructed with the right number of keywords to have people find you relevant to what you are selling on your main website.

Don't have them generated, you need to build them. Search engines tend to ignore the automatically generated pages. You can basically construct small articles and make sure you have the correct keyword density for the amount of content you will have on your side door.