Valheim is an adventure and action-packed survival game, and like any other survival game, you need food. At the beginning of the game, finding food is quite difficult. So it would be wise to set up a constant and passive supply of food at your Valheim base, as food plays a major role in it.
You won't be able to plant seeds until you've beaten the first boss, as he drops 'Hard Antlers' used to make a pickaxe that is needed to mine copper and tin. But, to take down the first boss, you must be fully prepared, and food is an essential element in Valheim for survival.
You can set up a fairly simple Boar breeding farm once you've built your simple shelter. Note that this guide is written assuming you've already established a basic starter base in Valheim. To create a Boar breeding farm, you must have plenty of wood, to begin with. You will need to follow a few simple steps:
Find Raspberry
Build a pen
Find and Lure Two Boars
Feed and Breed