What can I do with a 300mb fiber optic connection at home? How

In your service agreement i bet it bars you from running a server. If not you could lease the line to a server or 2 but bear in mind that your house is now their work space if they need access to the servers unless you own the hard ware, you gotta pay for power, possibly cooling, ect.
How much are you paying for 300mb service?
Unless you own servers and the like it would take years to relize a profit. Do you have a band width cap?

>>1107173
How close are your neighbors? Sell them internet access for less that they're paying now.

>>1107173
host ultra high resolution videos of you blowing random dudes who stop by your place to get their cock sucked, you double dip in profit by charging for the blowies and then for the video, 20% extra to take a shot in your mouth and 30% extra to spit in your eyes, lodge a camera in your throat to get a fps style view of the action

>>1107173
I have 1gbps fiber optic connection at home and I do nothing with it.

1gbps today is 100 mb / 10 years ago.

What could've you done with that 10 years ago? Host a small server for a small community, host a website - but of course hardware is just as important.

But 500 mb + internet implies more than average hardware.

Nothing, your house is not a good datacentre environment.