so I just started like 2 days ago and i accidently destroyed all my rocks.... what do i do?

They sort of "grow back" one by one, but it will take a few days.

Better idea! You take this opportunity to build yourself a rock garden! They're great! Put an item on EVERY square on your map but for where you want the rocks to go. When they spawn in 3 days (I suggest time travel) at least one should appear in that spot.

Fossils might appear in the open spots instead.. Keep at it until all the rocks are where you want them to go. They need a 3x3 area to drop items all the way around each rock, keep that in mind, hit rocks items drop all the way around it. I did this on my map, and like it!

They come back, one a day. Before hitting rocks make sure you have not eaten fruit. I saw someone fence in their rocks. They put a toilet at the entrance. That way they were empty before hitting. : )

Pfft lol a toilet. I mean, that's pretty smart - I personally don't like having rocks on my island, so I always destroy them, which probably isn't smart but idc. Anywho, you can have a total of 6 rocks on your island, and one comes back everyday.