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I think it don't exist. Maximum that you can find - it's tutorial. And i suggest you start learning c#
Go on Google Play Store. You can get lots of app.
If akichoe wants to learn Visual Basic that's up to them. Both Visual Basic and C# compile to the same managed common language runtime code. I am not aware of any mobile apps that teach Visual Basic but the following link is a good place to start... https://docs.microsoft.com/en-us/visualstudio/get-started/visual-basic/?view=vs-2019 Since you will require Visual Studio to program in Visual Basic I would recommend you go to one of the many VB websites for additional information. https://www.vbtutor.net https://www.thecodingguys.net/tutorials/visualbasic/vb-tutorial https://www.tutorialspoint.com/vb.net/index.htm