3 SQL Questions

Question

If I start making of an app for Android then first question is how to store data? for me , so I started to learn SQL and now my questions are
1."Making of SQL server is big project or smaller like I can create it in individual ?"
2."which software is needed to make server ?(windows)"
3."in which extension it's created ?"
Thanks

Answer 1

For the first one i think it depends on your needs and your project orientations so if it is for chatting with clients or users or to store they infos in your app you have to use API and look for famous servers .If it is simple app that don't need internet connection you can use android studio sqlite package for data storage.
Then for windows or linux based system you can use phpmyadmin and mysql server.
Third q databases have .db extension.