Salesforce Quick Actions and Global Actions are very useful and can be used in many different ways. Of course there are the basics of replacing URL hacks with Actions but they can now do so much more! From replacing Web to Lead and Web to Case in Communities, to showing key details and visual indicators to your users and all the way to building modular lightning pages! New features in Winter 18 and Spring 18 will be shown. You will definitely want to go back to your org and create a few Actions after this talk.