To be able to fishing you need a fishing rod and fishing bait that you can buy from a merchant.
How to fish:
- Equip your fishing rod and get some bait in your inventory.
- Look for fishes in the sea, lake, or similar. Don’t randomly throw your hook into the sea.
- Left-click using the fishing rod. Longer you hold left click further away the hook will go. You will spend one bait every left click.
- Wait until a fish hit your hook, when the hook goes down press right click and hold it until the fish is close enough to be able to pick it pressing E.
How to Spawn Items & Items Spawn Cheats;
Valheim – Item Spawn Commands Guide
Boss & Creature Spawn Cheats & Commands;
Valheim Boss & Creature Spawn Codes & Commands Guide
All Event Commands;
Valheim – All Event Commands Guide