[PostOnce]

(The below presumes you live in a mid- to high-income economy):

if you only need $300/month, and you can only do 2 hours a day, you're much more likely to find what you need locally by word of mouth (helping people fix their computers, setting up web accounts / etc). An hour or two a week would net you the $300/mo you need. It'll be easier to find that hour locally than on the internet.

making money on the internet doesn't necessarily scale down infinitely, for example you can't spend 6 minutes a day earning 4 dollars very easily; there's a minimum amount of time it takes to talk to people and arrange jobs etc.

I would look locally if I were you.