There isn't one single guide to learn everything about RoR, but I can recommend these "megacourses":
Ruby on Rails 6: Learn 25+ gems and build a Startup MVP 2020 20 hours of video, 200 lectures
Ruby on Rails 6: Learn to Build a Multitenancy Subscriptions SaaS app MVP [2020] 15 hours of video, 170 lectures
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There isn't one single guide to learn everything about RoR, but I can recommend these "megacourses":
Ruby on Rails 6: Learn 25+ gems and build a Startup MVP 2020
20 hours of video, 200 lectures
Ruby on Rails 6: Learn to Build a Multitenancy Subscriptions SaaS app MVP [2020] 15 hours of video, 170 lectures