This module is completely superfluous at first sight ... but still .. You can present content as a block by creating a 'custom block' and giving it a place on your page. You can also create a view that displays a block with, for example, the most recent content.
By default, the title of a node is offered as a block. Usually this block is placed at the top of the content. This module allows you to place the title as a field between all other fields and to give some layout.
This module is just the opposite as Blockfield. It converts a field into a block. For example, you can show an image of a content type somewhere in a block instead of between the other fields. This can be useful and is actually a kind of 'light' Panels or Display Suite.
You can use CSS to make every piece of your page Sticky. A menu bar then remains at the top when scrolling. You give the section a class or ID name and you add position: sticky. A CSS instruction that is fairly recent. Older browsers can not do this.
Menus are a collection of links (menu links). They can be added manually. Here you see an example of the menus of the site. Be carefull with the administration menu. It has all the links you need to administer your site.