What are the best practices for creating a Webflow slider that can be easily updated by contributors using the CMS? Can a background image tile be set for the slider to allow for future changes and updates by contributors? Are there any official resources or guides available for creating dynamic sliders in Webflow CMS?

When creating a Webflow slider that can be easily updated by contributors using the CMS, there are several best practices you can follow. Here's a step-by-step guide to help you achieve this:

1. Set up your CMS collection: First, you'll need to create a collection in the Webflow CMS to store the slider data. This will allow contributors to easily update the slider content without touching the design or code.

2. Create a dynamic list: Add a dynamic list element to your slider where the slides will be displayed. This element will pull in the content from your CMS collection and loop through each item to create individual slides.

3. Design your slider: Customize the design of your slider by adding divs, images, headings, or any other elements you want to include in each slide. Remember to make these elements dynamic, meaning they will display the content from the CMS collection.

4. Bind CMS fields to your slider elements: Select the elements within your dynamic list and bind them to the corresponding CMS fields. For example, bind an image element to the image field in your CMS collection, and a text element to the text field.

5. Style your slider: Apply the desired style to your slider elements, such as setting the size, position, and animations. You can use Webflow's built-in interactions or custom code to add additional functionality or transitions to your slider.

6. Publish and test: Once you've completed the setup and styling, publish your site and test the slider by adding or updating data in the CMS collection. Ensure that any changes made by contributors are displaying correctly on the live site.

Regarding the background image tile for the slider, Webflow doesn't have a native option to set background images for individual slides in the CMS slider. However, you can achieve this effect by placing an image element as the background for each slide and adjusting its size, position, and z-index accordingly.

As for official resources and guides, Webflow has an extensive knowledge base and tutorial videos that provide detailed information on creating dynamic sliders and working with the CMS. You can find these resources on the Webflow University website, which offers step-by-step tutorials, examples, and best practices on various topics related to Webflow design and development.

By following these best practices and utilizing the available resources, you'll be able to create a Webflow slider that is easily updated by contributors using the CMS, while also having the flexibility to customize the design, including background image tiles.