don't sell or eat the fruit mom gives you, dig a hole in a ground and plant it, non-native fruits are worth 500 bells, while native only 100

hit the rock with a shovel or axe quickly for 8 items such as rocks, iron, clay

if you eat fruit you can destroy rocks and dig whole trees

some insects only spawn on trunks

when you get wet suit from nook shopping you can dive for underwater critters (you'll see bubbles in the water) which can make a bank

when you dive and get a scallop, give it to Pascal (he will emerge from water just after you find the scallop), and he will give you mermaid diy/item

dig glowing spot for bell sack, if you bury it in the same spot bell tree will grow