This question comes up now and then, so I thought it'd be useful to have a cheat sheet. We're in a time of financial calamity but people still make art, and in the social media age there are ways for fans to help/validate/enable artists which are quick and free and essential to your favorite-but-struggling videomaker/musician/writer/cat photographer continuing on their path and being able to make more art, which is what this is all kinda about, que no?
In descending order from MOST GENEROUSLY HELPFUL to JUST SORTA HELPFUL.
1. Give them money or gigs. (Okay, this one is not free. The rest are.)
2. SUBSCRIBE to their Youtube channel. Or whatever their official channel is. Subscribing should be easy for anyone who has a Youtube or Google account. Every Youtube video's got a red SUBSCRIBE button next to it if you haven't subscribed already. Subscribing is extremely helpful because when producers or hiring folk look at an artist's Youtube page, they like to see that the page has a healthy regular following. And the best part is, subscribing obligates you to nothing, you don't even have to actually follow the artist, or have deeply considered all of their videos -- but by subscribing you've helped them a LOT. Subscribing means you might get an extra email from Youtube once in a while, big deal, you can get out of that on your preferences page. All the benefits of being a working artist who can pay some bills with their Youtube stuff (people do do this) lie in the direction of having LOTS OF SUBSCRIBERS. And it takes, like, 30 seconds at most.