We have used Nivo-slider module in most of the Drupal 7 Zymphonies Theme. Now, we are using Bootstrap Slider in all Drupal 8 Zymphonies Themes,
Not required to install any additional module to make Slider in Drupal 8 Zymphonies Themes.
Zymphonies Drupal 8 Themes has 'Slideshow' region to place the Bootstrap Slider.
Drupal 8 mobile-first approach that would allow to make great, relevant content to all devices such us smart phone, tablet and desktop etc. Drupal 8 helps to create an elegant and responsive mobile website with great SEO, larger potential audience. Drupal 8 has few default responsive theme, Bartik theme is fully responsive, so you can get responsive theme with Drupal 8 core.
Responsive Website/Mobile App is very essential part of current Business trend. All top level social media and eCommerce Companies has Mobile Websites. It can be Mobile App or Responsive Website. The biggest advantages of Responsive Website is single website can use in multiple devices like Desktop, Mobile, Tablets etc. But in Mobile App you should develop application for each Mobile platform iOS, Android etc.
Many of the eCommerce Companies are introducing Mobile App and concentrating on Mobile App. How to get more Business and attract Customers? Retail eCommerce Industries have Research and Development (R&D) team, R&D team will do the Research and Develop more Business. You might got many notification from eCommerce companies to install there Mobile App, There will offering many additional offer in Mobile App Sales. Why they are forcing to install Mobile? What are the benefits?
What is Drupal theme? How to develop Drupal theme?
Drupal is a open source content management system (CMS). Drupal have strong community in drupal.org. Drupal Themes make your Drupal websites beautiful and user friendly. You have to do the Design using Photoshop or any other graphic design tools. Design web templates based on your idea's and creativity. Design is not necessary but it will make your Drupal theme cool. User interface design help you to understand about layout look and feel how it will be after completing Drupal theme development.