1. EER stands for Enhanced Entity-Relationship. It is a high-level model to a modified and transitive version of an ER model. It helps to create database schemas with more accuracy.
2. CRUD stands for create, read, update and delete.
3. Postgresql, MySQL, MongoDB, and so on.
4.  Postman. Insomnia is easy to use and powerful.
5. The minimum API is 21; target and max will be the latest API (the current latest API is 28).
6. MVC, MVP, and MVVM.
7. Android Studio, Genymotion (free/pain), Remix OS, and Nox Player.
8.  ANR is short for Application Not Responding. When the application is stuck the UI because of some bugs in the background, then it occurs.
9. Sketch is the best, and Adobe XD is also a powerful app for designing prototypes.