All about database

Question

1. How does database created for Android app?
2.Making SQL server is paid if paid then what is the prizing starts from?
3.difference betn database,web services and API
and what's there work ?
4.is database,web services and API essential for online Android app?
5.What after making SQL server where that database created in that pc or anywhere another ?
I have asked before for it but I do not get
6.Can anyone explain me how can I get my android app online like FB , WhatsApp ,Zoom etc..
7.Which language I have to learn for that

Answer 1

🎃#H P 22™🎃 I have completed SQL before some days I have learnt only how to create table rows selection and language Syntax not learnt more
Like
API
And I will Google it