Use Kodi (Formerly XBMC)http://kodi.tvhttps://www.youtube.com/watch?v=nr5Mz2Yci4c
This is simply a media player, it doesn't actually bring you content. What it does however is catalogue your content and make it easily browsable. Beyond that, it enables add-ons which supplement the content. For example, if there are non-English parts of the film and you want subtitles, It will get them for you. If you want to know who some actor is, you can pull up their profile and see other movies or TV shows they've been in. It's loaded with features.
To use it, you download your content from whatever sources you have, and it will play them from your hard drive, or over your local network. The advantage to this is that people with connections too slow to stream online media can download it and watch it later without buffering every 20 seconds.
To find content, there is BitTorrent. Some of the content is legal (like the bitTorrent-only "Pioneer One" series), much is free of copyrights, but a lot of it is not. Use common sense there. If you download a major hollywood movie two months before it hits theaters, the MPAA might take issue with that. Network broadcast TV is available for free. While it is a copyright violation, they don't really pursue it. They ask that you visit their site to view it online, and often have incentive bonus or interactive content for doing so, but they don't really lose money on individual downloads as long as they can track the total number of views (which feeds into product placement deals). They could give you problems, but they don't. Then you have free content, usually indie-productions which are distributed freely without any restriction on downloads. Its up to you what content you go after.
An over the air antenna is best for live sporting events. There are online means of getting the live feed, but they are flimsy at best and get shut down constantly.
Of course, Netflix, Hulu, Vemeo and YouTube have tons of videos if you have a connection which can support the streams.
Personally, I'm not above downloading from pirate sources. I also have no issues paying for content, it's more a matter of convenience. I won't pay for cable or satelite. Basic packages with the channels I want start at $130 a month. I can't get channels ala carte. I either get 2,000 channels, 3 of which I might watch, or I need the basic package and can't have two of them. Even then, I watch maybe two shows on each of those channels. I would gladly pay the producers of the show directly for those shows. Bundling has driven me away from conventional TV services. Beyond that, a 30 minute show is now 17 minutes long, with 13 minutes of commercials. If I'm paying $130 a month, they don't need to waste 13 minutes of my time to make an additional 10¢ in ad revenue off of me.
The cable industry is dieing. Look at the demographics http://www.pewinternet.org/2015/12/21/4-one-in-seven-americans-are-television-cord-cutters/
The only reason the numbers are that high is that TV service is mandatory in some markets for top tier internet service. I can get 100MBps through my cable company IF I get the TV/Phone/Internet/Home Security bundle. Without that package, I can only get 30MBps. Much of the remaining subscriptions are attributable to Sports fans who don't have as many good online options for major events, and renters who get cable through their rental agreement. The cable companies, rather than innovate and compete for customers have resorted to strong-arming people. Hidden fees, long term contracts, requirements to lease their equipment, bundling services and content. You absolutely should get rid of paid TV service.
There are so many other options for cheap (or free) content. You pay for what you actually watch, the content producers make more money per viewer that way, while you pay less by cutting out the middle-man. No commercials, ever! I haven't seen a TV ad since 2001 (save for the odd superbowl commercial). And you can get real HD content... your HD cable package is upscaled 720p at best (they fake 1080). 4k broadcasts are non-existent in the US TV market. Online, they're all over the place.