How significant is a second date?

I recently went on a first date with a girl i matched with on bumble. I felt like it went well, but i was unsure if she was interested, but messaging her after, it seemed like she was more concerned if i was interested in her, so she probably is interested.

A day or two after our first date, she initiated talking about and setting up our second date. I'm not that experience in dating, so is this a good sign for the future?

How significant is a second date?
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