A gallery is a list of thumbnail images, there is not limit on the amount of images you want to display (an excessive number might slow the page), the images are loaded on demand. Click on the images to see the full size pictures.
Create more that one gallery in the same page.
Use - Gallery option to display a list of thumbnail images, click on the images to see the full size pictures. Add ALT description and title to the images, titles are displayed on mouse hover for desktops or over the images for mobiles.