Gardening is a really great way to earn kinzcash. It costs money to start off, but it will easily pay for itself and make you rich
1. You need to buy an outdoors room (or empty one that you have)
2. You need to buy some seeds (strawberries are the best if you don't mind dragging over a hundred of them to sell, or watermelon or pumpkins if you don't want to overwork your wrist.
3. plant them of course, but it is a good idea to leave a walkway between the doorways because i heard that it helps make it so it doesn't freeze up.
4. They only need to be raked, but you can water them if you want too. If they aren't raked, they will most likely die.
That will get you over 500 kc each harvest and maybe more depending on the crop
good luck!