Typically when you hear talk about supporting artists it means buying their work. That of course is terrific. But most of us artists who have to watch our nickles and dimes, know that not everyone can afford an original or can buy each print or card or magnet that we offer. There's another great way to support your favorite artists, and it is really simple: share their work on social media. Now being a follower is a start, but what I'm talking about is giving a 'thumbs up' a 'heart' or a 'like', a share, a re-post, or a re-tweet. Most artists can't afford much (or anything) for marketing & advertising so every share and like is really helpful and appreciated. If you're already a fan or follower just take that extra step when you're scrolling through and hit that button and be an active supporter!
P.S. Share an artists work from the venues he/she provides. Posting an artist's work, without really giving acknowledgment, their name, their website etc. is not supportive or cool.