How to Create Relationships Between Data Types in Bubble.io     Step 1: Define Your Data Types   - <ul> <li>Navigate to the Data tab in the Bubble.io editor.</li> <li>Click on the "Data types" under the App Data section.</li> <li>Create the basic data types that will be related. For example, if you are building a project management app, you might have "Projects" and "Tasks" data types.</li> </ul>   Step 2: Add Fields to Your Data Types   - <ul> <li>Under the Data tab, select a data type to which you want to add a field.</li> <li>Click "Create a new field" to add a new field to this data type.</li> <li>For relational data, the type of the new field will often be another data type. Set the field type to correspond to your related data type. For example, in your "Tasks" data type, you could create a field named "Project" with a type of "Project".</li> </ul>   Step 3: Define the Relationship Type   - <ul> <li>Decide whether the relationship is one-to-one, one-to-many, or many-to-many. </li> <li>For a one-to-many relationship (e.g., one Project has many Tasks), add a field in the "Tasks" data type that contains a single "Project". </li> <li>For a many-to-many relationship (e.g., users participating in multiple projects), use a list field. Create a field in the "User" data type called "Projects" and make it a list of type "Project".</li> </ul>   Step 4: Link Data Types Through App Workflows   - <ul> <li>To link data types through workflows, start by navigating to the "Workflow" tab.</li> <li>Create a new workflow that triggers an action, like a button click to create a new task.</li> <li>Add an action to "Create a new thing" and select the "Task" data type.</li> <li>Set the field values, ensuring to link the appropriate Project to the Task by setting the Project field to the current project's value.</li> </ul>   Step 5: Test Your Data Relationships   - <ul> <li>In Preview mode, test the creation of new items (e.g., create a new Project and then create new Tasks within that project). </li> <li>Check the resulting database entries under the "App Data" tab to ensure the relationships are correctly established.</li> <li>Debug and refine as necessary to make sure the data relationships function as intended.</li> </ul>   Step 6: Display Relational Data in Your Application   - <ul> <li>Use repeating groups and nested repeating groups in Bubble to display relational data.</li> <li>Create a repeating group for your "Projects" and inside each "Project" cell, nest another repeating group for "Tasks".</li> <li>Bind the nested repeating group's data source to the Current cell's Project's Tasks.</li> </ul>   Conclusion   - <ul> <li>By following these steps, you can create and manage complex data relationships in Bubble.io, enabling you to build intricate and fully-functional no-code applications.</li> </ul>