Apple's Confusing Modifier Key Icons

Problem: You would like to use a keyboard shortcut that appears in a Mac app's menu, but you don't recognize the modifier keys by their icon.

Solution: From Apple's website, here's a list of the modifier key icons...

 (Command key) - On some older Apple keyboards, this key also has an Apple logo
 (Control key)
 (Option key) - "Alt" may also appear on this key
 (Shift key)
 (Caps Lock) - Toggles Caps Lock on or off
 Fn (Function key)

How to Take a Screenshot on your iPhone

Issue: You want to take a screenshot of what's currently displayed on your iPhone (e.g., a webpage, a picture on the Instagram app).

Solution: Hold the On/Off button and quickly press and release the Home button. The screenshot will be stored in your photo library.