I was hoping I could get a better explaination in the forums about how to open a door if button1 or button2 are pressed in. (Cube-buttons)

I'm asking for an explaination of how to make such a door.
I don't hope you need an explaination of what an explaination is.

I know that it's possible with math_counter and logic_branches, but I dunno how.

Or did you want step-by-step, hold-my-hand, spoon-fed instructions?

Button (give both the same outputs)
OnDown:
toggle Branch
open Door

OnUp:
toggle Branch
test Branch

Branch
OnFalse
close Door

Usually, it's pretty simple to figure out how you need to arrange things. Just think to yourself "What do I want happen when the button is pressed, and under what circumstances?"

In this case you would say "When a button is pressed, I always want the door to open. When a button is let up, I only want the door to close if the other button isn't pressed"

ill try what ye posted.