I recently stumbled upon "The Changelog" podcast during my morning commute.
Two recent episodes feature the creator of Mastodon, and a discussion with Digital Ocean staff about their #hacktober event. They also dig little deeper into what people can do to get started, and contribute to open source. I highly recommend checking it out.
Fosstodon is a Mastodon instance that is open to anyone who is interested in technology; particularly free & open source software.