How to Specify Keyboard Settings on Your iPhone

You can customize your iPhone keyboard settings to suit yourself. By accessing the iPhone's Keyboard Settings screen (tap Settings→General→Keyboard), you can adjust a variety of settings related to how your iPhone keyboard works:

Autocapitalization: The iPhone turns this setting on by default. The first letter of the first word you type after ending the preceding sentence with a period, a question mark, or an exclamation point is capitalized.
Cap Locks: If this setting is enabled, all letters are uppercased LIKE THIS if you double-tap the Shift key. (The Shift key is the one with the arrow pointing north.)
. (the period): This keyboard setting inserts a period followed by a space when you double-tap the Space key.
Auto-Correction: Turn on or off the keyboard's autocorrection smarts by sliding this toggle switch on or off.

If you access the International Settings screen by tapping Settings→General→International, you can choose to use an international keyboard, which affects a number of iPhone features:

The language that you type (a custom virtual keyboard)
The language in which the iPhone displays text
The language in which it speaks through Voice Control

Heck, you can even select a different region format (from among numerous countries) and a different calendar type, among Gregorian, Japanese, Buddhist, and Republic of China.