Exploring SPFx capabilities
SPFx is not only about SharePoint anymore and offers a lot of capabilities beyond it, for instance, for other tools in the Microsoft 365 suite.
Depending on whether you work with the cloud or on-premises, possibilities won’t be the same due to technical limitations.
Enumerating differences between SharePoint Online and SharePoint On-Premises
SPFx lets you customize parts or integrate within the default SharePoint UI experience. It can be used both with SharePoint Online and SharePoint On-Premises. However, with the on-premises products, the maximum version of SPFx you can use is 1.4.1 for SharePoint Server 2019 and 1.5.0 for SharePoint Server Subscription Edition. For SharePoint Server 2016 SP2, the maximum version is 1.1.0. It means you are limited to the following solution types with on-premises products:
- Web parts for modern or classic pages
- Application Customizer
- Field Customizer
- ListView extension
All other...