Getting items and achievements is the best and fastest way to progress in Animal Crossing: New Horizons. There are a variety of challenges and things you do on your island. Something you can try to do quickly is get eight items from a rock and collect the champion achievement that splits the rock.
To retrieve items from a rock, you must first choose to have the tool of an ax or a shovel. It doesn't matter who you choose or what quality they are. You probably want to use the ax because you get it first in the game, and you get the shovel from Blathers later.
What you need to do is dig holes around you for better results. All stones are on a timer so you can try and hit them enough times to hit the correct items. You want to keep yourself from backing up, because all rocks have the ability to give you eight items. To hit this timer, you need to keep yourself from backing up and missing the correct shot. So if you get trapped next to the boulder, you can reach the timer and hit everything in time to acquire all eight items from it. You also need to make sure there is enough room for all the items to be spread around you. It takes time and luck.
There are many ways to earn Nook Miles in Animal Crossing: New Horizons. Be sure to regularly explore your island, other islands, and try to contact your friends to investigate their island if you have the chance.
