When my sister was in college, a classmate sold baked sweet potatoes at the school gate just after class, earning 1000 yuan a month. The porter downstairs in our company earns 2000 yuan a month. What matters is whether to eat or not.
Or you can have the ability, as upstairs said, to be a translator, run a business, don't know what you studied in college, or make money from your major.
Taobao is also a way to open a store, but unless you have a product or business strategy with a special selling point, it is not easy to earn 3000 yuan in the first month, because the reputation of the store has not been done yet.