1. what is mvvm,
2. why use mvvm
3. other aluternatives of mvvm
4. what is an architecture ?
5. what is viewmodel? why use it?
6. internals of viewmodel
7. how viewmodel survives configuration changes?
8. ways to get a viewmodel :
   1. viewmodelProvider
   2. viewmodelProvider with factory
   3. using “By” delegate in kotlin synthetic (KSP)
9. difference between livedata and kotlin flows
10. internals of livedata