Android Question Go to next screen(layout) when button is pushed

I'm new to here and i created a main screen with a logo , 4 buttons and some text.
Now i've created a second screen with foto's.
Because i'm not so far to know how i can create a photo gallery i put the photos separly in a imageviews.

But back to my question, how can i go to that second screen (new module) when i push the button on my first screen?

Thx for helping.
 
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