How to Sell Art Online
https://theabundantartist.com/
From the (American) website:
"On this site you’ll find hundreds of free articles, videos, and podcasts designed to help you:
- Build a Better Artist Website
- Sell Your Art Online
- Effectively market with social media
- Design your own ideal life style
- Become more business savvy
- Find the right community that will help you grow as an artist."