First things first, if you don't have an account on Adalo, go ahead and create one. Then, log in to get into the Adalo app-building environment.

Kick off a new project by hitting the "Create New App" button. Decide whether you want a native mobile app or a web app, depending on your target audience.

Pick a template that fits your e-learning platform's needs. You can go for a "Blank" template if you want more customization, or an "Education" template if it's available.

• Create screens for user authentication.
• Use Adalo's built-in user authentication to let users sign up, log in, and log out.
• Link the signup and login buttons to the respective actions using Adalo's action flow feature.

• Add a new screen that will serve as the home screen for logged-in users.
• Design this screen to show a list of available courses or categories.
• Use a simple list or custom list component to display course thumbnails and titles.

• Head over to the database section of Adalo.
• Create a collection called "Courses" to store course details like title, description, teacher, and content URL.
• Add another collection called "Users" if it isn't already there by default.

• Add some sample data to the "Courses" collection.
• Include fields for course titles, descriptions, images, videos, or any other necessary information.

• Go back to the home screen and link the course list component to the "Courses" collection.
• Make sure the data from the courses collection is displayed dynamically.

• Add a new screen for course details.
• Include text components for the course title and description, as well as a video player or image component for course content.
• Ensure the correct course data is passed from the home screen to this new screen.

• Add buttons on the course detail screen for enrolling in a course.
• Create a join table (collection) named "Enrollments" to map users to their enrolled courses.
• Set up actions so that clicking the enroll button adds a record to the "Enrollments" collection.

• Create another screen to display courses the current user is enrolled in.
• Fetch data from the "Enrollments" collection and filter it based on the logged-in user.

• Create fields in the "Enrollments" collection to track user progress, such as current chapter or completion percentage.
• Update these fields as the user progresses through the course content.

• Test the app thoroughly to make sure everything works as expected.
• Check user registration, login, course browsing, enrollment, and progress tracking.

• Once you're happy with everything, publish the app on the desired platforms (App Store, Google Play, or Web).

This guide should give you a solid foundation for building an e-learning platform using Adalo.