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.
To add social icons, you can simple use WIX free icons or icons from Google. To get icons from with, simply go to the add element once again and click on social. You will see the many icons including Facebook, Twitter, Google+, Instagram, Pinterest, YouTube and many more. Just drag and drop these icons from the social add element to the right part of your page.