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Also question is, does your computer have to be on to use steam Link?

You simply need to be logged in to Steam (using the same account and network) on both devices, whether they be mobile or desktop. You don't need the beta client for in-home streaming, by the way. With your host Windows PC (where the game streams from) and your stream destination (Android phone, another PC, etc.)

Subsequently, question is, how do I link my Steam app to my computer? Once you've got that all set up, open up the Steam Link app on your Android device. Go to the Steam Link computer settings and select “Other Computer.” You'll be given a pairing code which you'll need to use to connect with your Steam library on the host PC.

Additionally, can I play steam without a PC?

A new Steam app will stream games to tablets and TVs without a Steam Link. Soon we'll be able to play our Steam games on Android and Apple devices for free with an official app. Any device you stream to must be connected to a host PC (whatever's running Steam) via a 5GHz wi-fi or wired network.

Is the steam link worth it?

Properly configured, the Steam Link offered virtually lag-free 1080p gaming at 60fps in all but the twitchiest of games. Or, if you live in the U.S., you can still pick up a Steam Link before supplies dwindle down to nothing. It's well worth it even at the full $50 price.