Did you know Magento has its own Slack group? Its the Magento Community Engineering Slack group at magentocommeng.slack.com. Since I joined it has become one of my favorite resources. Everyone on there is super helpful and very engaged. There are tons of different channels in the group for different Magento topics, ranging from infrastructure and deployment groups to Magento’s current progress on building a Progressive Web App to Magento Cloud. You can request access to the Slack group by sending an email to email@example.com. I highly recommend this resource. See you on Slack!
P.S. If you are using Magento Cloud, Platform.sh has its own Slack group which comes in handy as well.