How to use Password Protection to auto lock your Apple Device

Password protection is important for the data security of your laptop, iPad, and mobile phone.

Apple Laptops: Setting up a Secure System using Password Protection

First, Look at your Apple Menu -> About This Mac to find out which version of the Operating System you are using, ie:

The instructions vary depending on which version of the system software you are running.

At the top of many of Apple's User Guide pages there's the option to choose your version of the Operating System:

Apple iOS: Setting up a Secure System on an iPad or iPhone using Password Protection

Use FaceID on your iPad Pro or iPhone