Avoid using a static font size or a custom font. If you're creating a custom widget or writing content for an Announcement or Discussion post, your font size will automatically adapt for smaller displays.
Avoid using static sizes for containers, tables, or images wherever possible. For instance, instead of setting an image to be 700 pixels wide, you could set it to have a maximum width of 100 percent so that it will fill the display (or the widget box) without overflowing the container or without enlarging a small image to the point where it appears blurry or pixelated.