This is a very basic tip but I thought I would include it here because it’s so handy.
You can change the font size on your Kindle using the “Aa” key. There are eight different sizes to choose from. Your current font size will be underlined. Use the controller to move and select the size you want.
Advanced Tip: You will also be able to change the words per line, screen rotation and the Text to Speech settings here. Just use the controller to access and change these options.