The best way you can customize and extend your SharePoint site is using the SharePoint Framework (SPFx)! The SPFx is the way you customize and extend the modern experience in SharePoint.
In this webinar, 20+ year Microsoft MVP Andrew Connell will share what the SharePoint Framework is & how to get started installing everything you need on your workstation to start building, followed by building your first web part showing data from your SharePoint site!
This webinar is for web developers new to the SharePoint Framework.