Hi! Our company is trying to come up  with a few pages with some manuals to teach our users how to use our products. However, these pages require username and password. My understanding is that user engagement will help a website's keyword rankings and Google will not be able to crawl or have access to pages requiring login as it doesn't have username and password. Based on that idea, does that mean all the content and user engagement on those pages requiring login won't help our overall SEO? Thanks in advance!