Learn Git by Building an SQL Reference Object - Build an SQL Reference Object

If you want to try to continue where you were @KonstantineTskhadadz, you can try the tips here to restart the step you are on.

I’m not sure exactly what you deleted, but they may have been files crucial for running the course. If that’s the case, resetting the step may not work. If that doesn’t work, there’s instructions at the bottom of those tips to start the course from the beginning again.