The bells are the name of the game Animal Crossing: New Horizons. You either need Bells to pay off your debt to Tom Nook or to buy new valuables valid for your island. They are always in demand. A great way to earn Bells early in New Horizons is by growing tarantula. It's the wrath of 8 bells, but it's an elusive creature. However, many players have discovered the best way to cultivate it and have often reproduced it on a single island.
First you need to make sure that you have access to the best equipment tools, such as the shovel, ax and net, not the fragile versions and the ladder. You can do this by progressively progressing New Horizons. Once you have them on you and in your inventory, purchase a Nook Miles ticket to participate in a mystery tour where you go to a random island. You want to do all your work from this island, not on your own.
When you arrive on the island, you will find plenty of insects, fish and trees scattered everywhere. What you need to do is chop down all the trees on the island and then dig up the stumps. Do it across the whole island on all levels. When you are finished, pluck all the flower petals from the flowers, but do not remove the stems from the flowers. You can keep them. After you have eliminated all of these items, you are ready to start taking out the other bugs on the island. You want them to disappear, so grabbing them and releasing them works, and running towards them to scare them is perfect.
Once all of these steps are taken care of, you should start to notice that only bugs found in the field will begin to appear. Constantly you will find more and more tarantulas on the island, allowing you to capture as many as you want and then prepare them for transport. When you have enough to fill your entire inventory, feel free to go, check them out at Nook's Cranny, and make a high profit with them. Tarantulas only appear from November to April in the Northern Hemisphere and May to October in the Southern Hemisphere from 19:00 p.m. to 4:00 a.m., so make sure you do it all night, during those months.
You can redo this technique as many times as you want from different mystery tours. Make sure to start the island after 19:00 PM, otherwise you will not receive the spawn timer for tarantulas or any other bugs during the period.