Rookie me,back when I was making my first Android app...
After a lot of hours put into it, finally finished it...pretty much was ready for deployment...some final touches...but oh wait... I was messing with some files-wanted to delete something and misclicked the whole folder...well my brain farted for a moment and clicked yes-I managed to erase the whole fucking app I was working for months...!
The whole world shut down at that moment! What the fuck did I do?...
In this point I want to thank jetbrains for their magical revert button....
Moral of the story: Learn Git, backup everything and don't be too excited and fuck up tremendously...!