You'll need to fish to catch, well, fish, so here's how to do it.
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How To Fish in Animal Crossing New Horizons
Fishing is simple in Animal Crossing New Horizons, once you get the hang of it.
Early on, you'll be able to craft a 'Flimsy Fishing Rod' which will be stored in your inventory.
Press the X button to open it, then select the rod and select 'hold' to equip it.
Once you've done this, head to a body of water and press A to cast your rod. You'll want to aim at the shadows of fish, specifically in front of them to entice them in.
Fish will then nibble, often more than once, before properly engaging with the bait – denoted by the water moving around it and the bait moving. When this happens, press A quickly to reel them in.
Then you can show Tom Nook, or sell it for bells.