Select the first App you want to have on your screen, click its Maximize/Restore button (see screenshot below) and hold down the mouse button (or trackpad, touchscreen etc). An ‘arrow’ will appear on each side of the Maximize/Restore button. Select the arrow on the left.
The App will be sent to the left side of your screen and resized to fit perfectly.
Now locate the other App you want to have on your screen, click and hold down its Maximize/Restore button and this time select the arrow on the right.
The two Apps will now share the screen equally.
You can repeat the above steps with other Apps and assign them one side of the screen or the other.
If you’re a keyboard-shortcut person you’re in luck – you can use them for split-screen on a Chromebook too! When you want to have an app take up the left side of your screen, use the keyboard combination Alt + [ When you want an app to take up the right side of your screen, use the keyboard combination Alt + ]