You want to build an app using SharePoint Framework and wonder which framework you should use? Here's my personal advice.
Microsoft 365 is a rich platform for building applications. Here are the types of apps you can build on Microsoft 365.
Using SharePoint Framework you can extend portals on Microsoft 365 and expose your apps where people work. Here are some resources to get you started.
There is no 'i' in Teams, but there is 'me'. Here is how you could build a Me-experience in Microsoft Teams to stay informed and easily track your work.
Did you know that you can use SharePoint Framework to also build applications for Microsoft Teams?