Tap a couple oak trees as soon as you can and hold onto the oak resin. You’ll need a lot in the not so distant future.
Hoe the little wiggly worms you can sometimes find in the ground.
Watch tv every day, you get good tips and often learn cooking recipes. Though you can’t use the recipes until you upgrade your house later in the game.
Fishing can give a lot of money!
Use your sickle to cut the little bushes for a chance to get seeds to plant (free money)!
Enjoy the game! I have too many hours in this game. Playing it for the first time again would be such a joy!
ETA: Also go to the south and collect the spring onions to eat for energy before salmon berry season hits. Then go salmon berry hunting each possible day for a basically endless energy supply.