Try some of these search terms:

Beginner Advanced RecyclerView Firebase CodingWithMitch Firebase Cloud Functions fcm push notifications
Firebase Phone Authentication

updated March 21, 2019
Lambdas for Android Development (Java)

updated March 20, 2019
The Preferences Framework and Settings Screens

updated March 14, 2019
UI Testing with Espresso: Getting Started

updated March 14, 2019
Google Certified Associate Android Developer (AAD)

updated March 14, 2019
Glide: Getting Started

updated March 14, 2019
Notifications on Android: Getting Started

updated March 4, 2019
Playing Video in a RecyclerView with ExoPlayer

updated March 4, 2019
Custom Broadcast Receivers

updated March 4, 2019
Broadcast Receivers: Getting Started

updated March 4, 2019
Work Manager: Getting Started

updated March 4, 2019
Filtering a RecyclerView with SearchView

updated March 4, 2019
Retrofit2: Getting Started

updated March 20, 2019
Swiping Views with ViewPager

updated March 4, 2019
SQLite and the Room Persistence Library

updated March 4, 2019
Memory Leaks on Android

updated March 4, 2019
Finding Memory Leaks with Leak Canary

updated March 4, 2019
Bound Services on Android

updated March 4, 2019
Model View View-Model (MVVM): Getting Started

updated March 4, 2019
What is AndroidX?

updated March 4, 2019
Getting Started with ExoPlayer on Android

updated March 4, 2019
Horizontal RecyclerView

updated March 4, 2019
Staggered RecyclerView

updated March 4, 2019
RecyclerView OnClickListener

updated March 4, 2019