I know oops concept in java,. Now I have two ideas one is to learn android app development and the other is to learn web development backend coding...
If your answer is to go with web development backend coding, what should I learn??
Else:
Give me your suggestions!!
I'm confused..

Try out either. Android is an OS and with that there's a lot to learn, but can be rewarding if you stick with it. It really depends on what you want to build. There's different frameworks for different things. I recommend getting some SQL and JDBC skills because you will definitely have to use a db of you do any serious development. To clear this up you could do a restful backend with java (Jeresy is a known library for rest) which will be on a remote server of course and then develop an android app that consumes the rest api. If these terms are confusing look at these links https://docs.oracle.com/javaee/6/... and https://tutorialspoint.com/restful/...

You could also do a 2d video game on android that doesn't require a db and would be tough enough to have to learn android. I did a hangman game with music and sounds effects. Give that a try! It will make you think about GUI, Async tasks, and events...

Oh if you go the video game route try to do it without the help of a game engine. Just raw java. I did vector drawing for the hangman pole for the menu and the man itself would change color (very simple animation) while music played. So you have two task operating which is multithreading. If you want a big reference I see good reviews with this book: https://amazon.com/gp/aw/.... Btw WELCOME TO devRANT!!!

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@dalastTomCruise Thank you

@okkimus ??

@RobinJesba
It's just a way to make a "bookmark" for oneself. Commenting on a rant gets you updates (if someone comments on that rant later).

So if there's interesting topic you can "subscribe" to them like that :D

You should follow these tutorials
https://javavogue.com/2018/11/...
https://javavogue.com/2015/03/...