Managing your content is primarily done in the Control Panel by clicking on the menu button.
You can select multiple types of posts at a time and choose operations such as publish, unpublish (i.e. making content visible to the public) and delete items.
Posts marked "Sticky" stick to the top of any list in which they appear. Normally posts are displayed in the order of their publication but there maybe times when you want to feature particular posts. To mark content as "Sticky", edit the page and at the bottom you will see "Publishing Options", check the box