Seven steps to build and deploy SPFX web part to SharePoint

1. Install Node.JS
   Use this link to install Node.JS https://nodejs.org/en/
   
   
   2.       Install yeomen and gulp
   CMD>npm install –g yo gulp
   
   
   3.       Install SPFX generators
   CMD>npm install –g @microsoft/generator-sharepoint
   
   
   4.       Create First Web part
   CMD>yo @microsoft/sharepoint
   
   
   5.       Run and Test Project
   CMD>gulp trust-dev-cert

         CMD>gulp serve

   
   

   6.       Package and Deploy

          CMD>gulp package-solution
   
   
   7.       Install and Add on Page
   A.      Upload the *.sppkg file in app catalog
   B.       Add new App from site contents page
   C.      Keep app running in local
   D.      Create new page and Add App