Q: Not enough disk storage space, & Photos delete issue

The App Photos was auto-installed after my mac system updated to version 10.10.3, then i found the storage of my mac air of 256GBs only left about 4GBs.

Although Photos took the most space about 134GB and I tried to delete  some of my photos to get some space back, it seems doesn't work well.

the storage summary shows " 67GB-Other", and "11GB-Movies". Actually i don't have any Movies saved in my Mac, neither any idea for Other that took most of the space.

So please help advise:

1. Is it normal for the mac with 67GB-Other storage even i didn't install too many applications?

2. How to clean up the 11GB Movies storage?

3. When i delete photos from app Photos, where is the deleted pics locates? or they just gone from Mac forever even not into the Trash as iPhoto did? If i delete photos from iPhoto, how do i delete same pics from Photos?

thanks for the soonest reply.