Door: Entrance/exit of a room or building (दरवाज़ा/ किवाड़)
Please close the door of the classroom.
She knocked on the door before entering.
Gate: Entrance/exit of a compound, park, large area (फाटक / मुख्य द्वार)
The gate of the park opens at 6 a.m.
Security guards were standing at the main gate.