Most of hosting provide SMTP feature, SMTP is an Internet standard for electronic mail (email) transmission. In simple word if you want to send email by system you need SMTP.
# App ID
If you want to develop android app or website to view data from youtube you can read this documentation https://developers.google.com/youtube/v3/
Category Icon will display at android as icon at category or topics, good icon will help user to catch the information and easy understand about category. So make sure you pick the best icon for category.
Continue reading Guide icon for Admin Panel
From your firebase admin please click Add Firebase to your Android app like this picture :
1. go to : https://console.firebase.google.com/ and login to your google account.
In this article I will show you what you need to prepare to implement Google analytics to your android App.
1. PREPARE API_KEY