In Stardew Valley, the most basic foraging resources are wood, sap, stone, and fiber. Everything that drops these resources reappears at least once per season, so it's usually pretty easy for players to stockpile all four. However, the game also has plenty of different ways to spend them.
Stardew Valley: How to Farm Fiber
Fiber is a plentiful resource in the wilds of Stardew Valley, but when nature falls short, there's a way to grow fiber on the farm.