Q:

Where to draw in libGDX

i made a game in libGDX for android. I made a main screen that extends game, i also have blank screen and a game screen where you actually play the game. My question is where do i create and where do i render the game. i tried to create a texture in the main screen and render in the game screen. but i get erros. 
Main Screen:
package com.mygdx.paper;
import com.badlogic.gdx.Game;
import com.badlogic.gdx.graphics.Texture;
import com.badlogic.gdx.graphics.g2d.SpriteBatch;

public class Main extends Game {

    Blank blankScreen;
    Game gameScreen;

   @Override
    public void create() {
            blackScreen = new blankScreen(this);
            gameScreen = new blankScreen(this);
            setScreen(blankScreen); 

    }
 }

Blank Screen:
package com.mygdx.paper;

import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.Screen;
import com.badlogic.gdx.graphics.GL20;

public class Blank implements Screen {

Main main; 

public Blank(Main main) {
    this.main= main;
}

@Override
public void render(float delta) {

    Gdx.gl.glClearColor(1, 1, 1, 1);
    Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);
    if (Gdx.input.isTouched()) 
        main.setScreen(main.gameScreen);
}

@Override
public void resize(int width, int height) {
}

@Override
public void show() {

}

@Override
public void hide() {

}

@Override
public void pause() {
}

@Override
public void resume() {
}

@Override
public void dispose() {

}
}

Game Sceen
My game screen has everything in it like create, render.
But it does not work when i click on the blank screen.

A:

Here:
blackScreen = new blankScreen(this);
gameScreen = new blankScreen(this);

you set a new blankScreen instance for both screens: blackScreen and gameScreen. So after touching your blankScreen you will see anther blankScreen an so on..
You might actually want to actually assign a GameScreen (..or whatever your games screen's class is actually called) instead:
gameScreen = new GameScreen(this); 

BTW: there is a really nice tutorial about screens in libgdx

