I deleted my src folder from the catkin_ws, how do I restore it?

I deleted my src folder from the catkin_ws from ros basics in 5 days

I think you need to make update&upgrade.

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I am new to the construct, I am not sure how to update and upgrade. Can you please tell me how to do that?

Type in this in your CLI:

cd
cd /catkin_ws
catkin_make
source devel/setup.bash
ls

After this you should see the /src folder.

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