I Googled slack channels list for things I am interested it. Like Front End, Startups, Laravel, WooCommerce etc. You would find 100s of channels. See the ones which have many members. They would have a online form to join them. Join the ones that are free. There would be some who would ask for a membership fee. I personally don't think paid ones are worth the money. https://medium.com/startup-frontier/100-slack-communities-fo...