Some terrific shortcuts here. My favorite:

Typing punctuation can be a drag on an iOS device. Take the humble question mark. First, you must tap 123 key to get to the number and punctuation keyboard, then tap the question-mark (?) key, and then tap the ABC key to get back to the letter keyboard.

Here’s a quicker way to do it. Tap and hold the 123 key. Now, without removing your finger from the keyboard, slide your finger over to the question-mark key (or any other punctuation mark) and then release. The keyboard will insert your symbol and automatically switch back to the ABC keyboard.

This trick is even better if you want to type a special mark, such as the upside-down question mark (¿).