Interesting webs for developing I've found
Adding frames to your screenshots (perfect for Play Store) https://theapplaunchpad.com/mockup-generator/?device_type=Android#new-heading-mg
http://www.thewindowsclub.com/add-a-device-frame-to-screenshot
https://github.com/MindorksOpenSource/android-mvp-basic-sample
//How to manke relations with Android Room https://stackoverflow.com/a/44424148/6110433
//Ideas for App style https://www.uplabs.com/android
//How to stay up to date with Android https://medium.com/@n8ebel/stay-up-to-date-as-an-android-developer-7922dfb953ac