Answer:
I go up but never come down. What am I?
I direct you from outer space.
To cross the water I'm the way. For water I'm above I touch it not and truth to say I neither swim nor move.
There's a one-story house in which everything is green. Green walls green windows green doors. What color are the stairs?
I can be simple or I can be complex. I can be found in this riddle or in everyday life. I can be shapes or even colors.
No matter how little or how much you use me, you change me every month.