What about using Chromecast for that? Can I just make the Steam Link act like a Chromecast? I have several Chromecast and I don't think I'll be using it much for gaming because of work
The Steam link's main purpose is to allow you to play the steam games that are on your desktop on your big screen TV that's somewhere else in your house. You can either use a controller or hook up a wired/wireless mouse/keyboard and essentially use your PC from your living room. If you don't think you're going to use it for gaming primarily, then I would suggest you not buy it. I really like mine because when I don't feel like playing, I can use it to access my desktop PC whenever I want and say for example, go to crunchyroll to watch content there without having to use an app.
The steam link is essentially an enhanced chromecast for Steam on your PC. I mean, technically if you can watch it on your PC, you can watch it on your big screen now through the steam link. However, you'll still need to open up your web browser or windows explorer and search for the content yourself in order to watch it. That's why I like using the steam controller. It'll never replace a mouse, but it does allow me to open up things on my PC without much hassle.
I've never tried it, but you could, for example, add VLC media player to Steam as a non-steam game, and open it up on your big screen TV and view content that way if you don't want to bother going on your desktop, but again, you're better off sticking with your chromecast in that case.