What are some things to do in order to keep monthly expenses down?

I’m moving out of my parent’s house for the first time, so money will be tight. I am thinking I will only be getting internet as opposed to both internet ans TV.

Does anyone know how to connect your computer to your TV so that what you are watching on the internet shows on your TV? I so have a desktop, not a laptop. Are there ways to see live TV on the internet, so that I can then stream it to my TV?

Any other suggestions as to how to keep other costs down? My heat and hot water is included in rent, so it’s only electric and anything else I want to hook up, which won’t be much.