Quicklinks and Services can be found from the pages section of Universe. They can be embedded Google documents, Google Sites, forms, or any other view that your users may need to find easily.
The main difference between the Launcher and Quicklinks & Services is that the Launcher launches the user outside of Universe, while Quicklinks & Services keep the user inside universe.
Important: If you embed a link to quicklinks or services you need to make sure that the source allows embedding. For example Google Sites requires the "Allow embedding" setting to be enabled.