accidentally renamed folder, work gone?

This is my first day using Unity so I apologise if this is silly but–

Today I started a new project to test out some terrain possibilities. Because I didn’t initially intend to keep the project I didn’t set the save location and just went with the default name. However, I did decide to keep it so I stupidly went into finder and changed the folder’s name which caused a fatal error. Now when I go to open up my project the terrain is gone (under hierarchy). Is my work gone for good???

You just renamend the project folder, which contains the folders “Assets” and “Library”, and maybe “Temp”? That shouldn’t be a problem. Maybe you lost the scene you were working on (hence the empty “Hierarchy” view), but all your individual assets are still there, in the “Project” view. Find your terrain there, and just drag it into the Hierarchy view, and start from there.

@Wolfram
I hope I’m not bothering you by reviving this topic, but it’s similar to my problem.
Today I stareted using Unity and I decided to include Standard asset example, the one with the car and (i’ll call it) the “race testing ground”.

Everything worked just fine until I decided to go on “new Scene”. Now I don’t know how to get back on the “race testing grounds” example with car and other objects. What should I do?