So I was pinning some servos and inserted an external 7v pin to the 5v pin on the arduino uno
which I misplaced instead for the A0 pin to the servo.
I have no knowledge dealing with the arduino uno itself apart from basic robotics stuff cuz im noob.
Now this error shows up please help 
.
.
.
Arduino: 1.8.13 Hourly Build 2020/03/09 11:33 (Windows 8.1), Board: "Arduino Uno"
Sketch uses 5336 bytes (16%) of program storage space. Maximum is 32256 bytes.
Global variables use 277 bytes (13%) of dynamic memory, leaving 1771 bytes for local variables. Maximum is 2048 bytes.
avrdude: verification error, first mismatch at byte 0x0000
0x1d != 0x0c
avrdude: verification error; content mismatch
avrdude: verification error; content mismatch
As far as I'm concerned, you have blown up the main micro.
If it's a DIP version, you can buy them with boot loader.
You might have damaged more though.
Hello Man, You fully damaged your chip. The error message is showing the verification error because the chip is damaged and not working. I suggest you to buy a new board, or if you are familiar with electronics, you should buy yourself a new Atmega328 chip which costs around 2$. You would have to replace the damaged chip with new one. Then the board will be working like before. The problem isn't in the board, the problem is in the chip which you need to replace. There is no way you can fix your damaged chip. You need to either replace it or you need to buy a new board.
Never do such things again. Double check the connections before doing anything.