How many teams/projects can I create with the free version?
Welcome, @Dustin4. Unlimited projects and I think unlimited teams too–certainly more than anyone would need. Additional details at:
My understanding is that projects/tasks/teams are unlimited with the free version but you cannot control the privacy on those projects/teams so everyone would be able to see the information. It all depends on what you are wanting to use it for to determine whether the privacy factor is important to you.