Step by Step – Create a very simple PowerApps Custom Component to show the GUID of the record – Nishant Rana’s Weblog

Go through below articles to get a better understanding

Below is the quick step by step guide to get started (sort of Hello World example) 

• Install NPM (that comes with Node.js)

https://nodejs.org/en/

http://download.microsoft.com/download/D/B/E/DBE69906-B4DA-471C-8960-092AB955C681/powerapps-cli-0.1.51.msi

• Install Visual Studio 2017 or later or Download .NET Core 2.2 along with Visual Studio Code.

• Create the new folder for the project, and in Developer Command Prompt for VS 2017…