If you're using MacBook keyboard, you will see a Fn key. When this key is pressed, F1-F7 keys will become standard function keys.
Fortunately, you can change this behavior so that without pressing down Fn key, F1-F7 keys are already functioning as standard function keys.
The good thing here is, you can easily perform keystrokes that include these keys, such as Control F1.
Here are the steps to change these function keys' behavior:
The bad thing is, usually these keys come with Brightness and Volume Adjustment, i.e. after the changes you will need to press Fn to adjust brightness and volume.
Some articles taken from our resource base, tightly related to current article, to empower you with more knowledge on tweaking the most out of your Mac.