I tried, but I suck.
Can someone tell me how to do mapcoordsmins and mapcoordsmaxs?
I tried putting pics on but over the limit 
-Matt
Mapcoords Command Map
First, click on a brush, press “n” and write:
-mapcoordsmaxs ( bottom right corner), put your mouse at the end of 2 walls and then look below line, there should be written the coords.
-mapcoordsmin, (top left corner) do the same.
Now, you should be ok 
well, mapcoordsmaxs and mapcoordsmins just tell to the game how big your map is.
This also help for cmd map, otherwise you could make a box like 50000, 50000. But this is not necessary and alod would lower your fps ( probably)
No no no, I can’t figure out what mine are.
Like I don’t know what mine are.
how do i tell?
With your map open in Radiant, concentrate on the 2D window. Make sure the view is displaying the XY axis.
The mapcoordsmins is the top, left point expressed with a negative X value and positive Y value.

In this pic, key=mapcoordsmins, value= -256 256
The mapcoordsmaxs is the bottom, right point expressed with a positive X value and a negative Y value.

In this pic, key=mapcoordsmaxs, value 256 -256