How do you indicate something is scrollable?
Indicate content overflow by cutting off grid tiles. Or alternatively you can directly ask users to scroll. A subtle cue, such as an arrow pointing off-screen or a text “scroll down,” can inform users that most of the content will be laid out linearly.
How do you use scrolling?
How to scroll using a touch screen. On a touch screen device, swipe your finger up or down to scroll the screen up or down. Swiping up scrolls down and swiping down scrolls up. If the screen has a horizontal scrollbar, swiping left scrolls right, and swiping right scrolls left.