Just wanted to come back and let you know that I have added some notes to look at the items in question there.
With regard stars, it would be ratings you would be looking for. These are simply the rating of an item, and a visual thing. It doesnt really do anything more than show someone what other people rate that topic.
Lazy loading is actually enabled by default, and generally items where you are unsure such as these should be left in their default configuration. In fact nothing in the advanced configuration should be changed, unless you are an advanced user who knows to change these for a specific reason. Lazy loading itself means that when items are not loaded (images for example) until the user can actually see them. So they will load when scrolling down a large page, rather than all loading when the topic is initially opened. This means the topic loads up faster for your users