How do I join art & crafts clubs in Amsterdam?

Pick a club above and open its page. Most let you sign up for their next event right there, or link to where they take sign-ups. You don't need to be a member first.

Yes. Lots of people come to their first event alone. Each club page says what to expect.

How much do art & crafts clubs cost in Amsterdam?

It depends on the club. Many events are free, and paid events show the price before you sign up. You pay per event, not a membership.

How is this list ranked?

By what people do: who keeps coming back, who books and follows, and what's coming up. It updates itself as clubs host events. No club pays or asks to be on it.