Terrain is a curated online course marketplace that emphasizes course completion over hoarding, with vetted courses costing creators nothing to host and taking a percentage in return; users can earn points for completing courses, trade them in for discounts or donate to charity; the platform offers features like badges, LinkedIn certificates, discussion boards, and dark mode, as well as a community hub for users to ask questions and connect with others; Terrain was built on Bubble's no-code platform due to its robust features and options, and the founder discovered it through an ad and YouTube videos; milestones include launching the app and seeing course creators earn significant income; future plans involve turning Terrain into a vibrant learning community and becoming a go-to platform for entrepreneurs seeking practical skills.