I would recommend taking a look at this page on Trello: https://help.trello.com/article/927-what-are-teams - this goes through workspaces in a bit more detail. However, it looks to be that there is no limit on the number of free workspaces you can have.
I hope this helps, let me know if you have any more questions :)
All the best,
Congratulations to @Laura Holton , our latest winner of Taco Tuesday! And thanks to @Kristjan Geir Mathiesen - Origo for sharing the picture of Taco having fun with his new friend...
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