The document discusses how to build a subscription center in Marketo without coding by using various Marketo features like custom fields, forms, smart lists, campaigns and landing pages. It provides step-by-step instructions on setting up custom fields to capture opt-in/opt-out preferences, creating forms to collect this information, adding logic to direct subscribers to confirmation pages, setting up smart lists to track opt-in/opt-out status, and building campaigns to handle list transfers when preferences change. The goal is to allow potential subscribers to select topics of interest and opt-out preferences and then manage the subscription process without requiring technical skills.