Security Best Practices

Security is a very complex process, affecting applications, networks, databases, facilities, and more. This week we will examine security considerations. Specifically, I am looking for you to provide simple best practices all users (and companies) should follow. Within your post:

Network Security

Provide 5 to 10 network-security best practices
Mobile Security

Provide 5 mobile-computing-security best practices
Facilities

Provide 5 to 10 physical security best practices