I am using UiPath Studio Community Edition - I am learning the Lesson 1 - Introduction to UiPath the demo is showing the studio is having App Integration node under Available node. But my Studio does not have it.
How to add App integration node under Available tree in my activity panel - UiPath Studio Community Edition
Click the manage package , under Available -> All , Install the Uipath.Excel.Activities and Uipath.Mail.Activities.
Thank you @balupad14 it has solved my query.