A perfect example would be a photographers portfolio website. They may have different pages for different types of photos such as nature, cars even maybe something small such as street signs. Having a car page would mean, no images of nature should be in the gallery of the car page, unless the photo over laps each category. Then the photo could be an exception.
However, this lack of creative control can be frustrating. Wix ADI is not nearly as flexible as Wix Editor, which offers smooth drag-and-drop design and easily editable text boxes. So, while you can enjoy simplicity with both Wix tools, the Wix Editor offers more freedom. It also builds more personal sites, thanks to its Premium plan upgrades and wide choice of apps.
The basics of SEO are very important to comply with. They help search engines understand your website and what it is about. Using algorithms search engines will then rank your site appropriately to specific searches. Ideally you want your site to be on the first page of a search, which can be very hard. Generally the basics of SEO does not achieve first page ranking as it requires a bit of work and effort to do so.
Similarly to adding almost anything to your site, to add a gallery, you use the add element again. Each gallery you will see will be different from each other. From professional looking galleries to the less so professional. Wherever you choose to place a gallery on your site, always make sure the images are appropriate for the page or your website.