CSS media queries media screen

Question

The queries I have on my WordPress theme are as follows, and they are numerous ;/

I can't grasp them because I'm new to WordPress, but I'm sure I'll understand your explanation.

What I don't comprehend is this.

1: I'm not sure which screens they are for.

2: I'm not sure what the "max" ( this one is very strange )

3: Will the maximum width cause the setting to be terminated? thus we have 600 minimum and 600 maximum.

This is the code.