The designers should avoid displaying a UI element that tells people to rotate the device. Running in the supported orientation clearly tells people to rotate the device, if required, without adding unnecessary clutter to the UI.
Give tappable controls a hit target of about 44 x 44 points to Make it easy for people to interact with content and controls by giving each interactive element ample spacing.
We should always take the color blind people’s situation into consideration and be aware of color blindness. Most color blind people have difficulty distinguishing red from green. Test your app to make sure that there are no places where you use red and green as the only way to distinguish between two states or values.