If you tap and hold down certain keys on the keyboard, you will be presented with a number of different character options. For example, if you tap and hold the .com key, you can choose from .edu, .org. and .net. Holding down the vowel keys will give you many accented character options. Tap and hold the period key and you have ellipses options (…), dollar “$” has many options, apostrophe, and so on. Experiment on your own to find special characters you may find useful.
Here are some screenshot examples: