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How to use GOTO CMD in quadrotor

I want to sent a coordinate (lat,lon) of my target to my drone to go to there and hover. I saw a MAV_CMD_OVERRIDE_GOTO command but i doesn’t work .

You can do this in GUIDED mode.
https://dronekit-python.readthedocs.io/en/latest/automodule.html#dronekit.Vehicle.simple_goto
https://mavlink.io/en/messages/common.html#mav_commands

Do you have any example on MAV_CMD_NAV_WAYPOINT . I send that command in command long but it doesn’t work

No you can’t.
You should send them as mission commands.
I recommend you to take a look at the dronekit python source code.
For example send waypoint command in guided mode

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