In "SharePoint Flows from Scratch," Microsoft certified SharePoint expert and trainer Peter Kalmström explains how you can use Microsoft Flow with SharePoint to automate business processes. Peter starts with the very basic about Microsoft Flow and continues with more advanced features and use cases. After the first chapters of basic information about automation and Microsoft Flow, Peter gives example flows. All these flows have a theory section that explains more advanced features used in that particular flow. There are also many images and step by step instructions, and the references to kalmstrom.com Tips articles with video demonstrations makes the learning process varied and more interesting.
Sharepoint Flows from Scratch : Automate Sharepoint Business Processes with Microsoft Flow