Learn Sharepoint in 30 minutes | Microsoft Sharepoint training | Sharepoint working explained

Using Microsoft's SharePoint Online to Create an Intranet Site

How to create an Intranet in SharePoint

SharePoint framework tutorial: Set up your development environment and Create web part using SPFx

Set up your SharePoint Framework (SPFx) development environment

Set up your developer environment - Mastering the SharePoint Framework (SPFx)