To install the web part on your website for the SharePoint Modern Experience, then you are in the right place. 😉

  1. Login on your admin center page with an administrator account and select Admin;

    Admin Center.png

  2. Open the SharePoint Admin Center;

    SPFx SharePoint.png

  3. On the left pane, click on apps and then App Catalog;

  4. On the left pane, click on Apps for SharePoint;

    APPs for SharePoint.png

  5. Now click on Upload and select the .sppkg file that's inside the spfx folder in your web part package.

    Install SPFx.gif

  6. Finally, on the pop up that appears, tick the checkbox Make this solution available to all sites in the organization and click Deploy;

    Trust and deploy.png

And that's it! The web part is now installed.