We rely heavily on copying and pasting on our smartphones to speed up text editing since there is no mouse and keyboard. Just like on a computer, copying is usually limited to one object at a time, but with the Samsung Keyboard app you have the ability to copy multiple sets of text.
Touch the ellipses (•••) on the top row of Samsung's keyboard and you will see several icons that you can drag to the top row. Drag the one labeled "Clipboard" to the top now and tap the ellipses again to return to the default keyboard view.
When you tap this icon I see a list of everything you recently copied. Click on an item to paste it into the active text box. Even better, screenshots will also appear in Clipboard and can be pasted into supportive apps, but I thought this only worked in the Samsung Notes app right now.