Every view in GraphQl Editor has an onboarding tour. It will guide you through all the features and help you with the complicated stuff. If you want to reset onboardings go to Home > Help > Reset onboarding tour.
A tutorial which shows how to use the Graph section of GraphQL Editor and teaches GraphQL itself. To start the tutorial click Home > Help > Interactive GraphQL Tutorial.
Example projects are located in the explore-projects workspace. They help understand how to use certain features of GraphQL Editor. Load one up and you'll find filled API, Microservices, Libraries and JS Playground sections for you to play around with.