How to set a managed account up for a child, or another vulnerable user, using Parental Controls.
parental controls
As a parent, threats to children now seem out of your control. Should you let them have that Internet-enabled Barbie doll, or remain a Luddite?
El Capitan, and previous versions of OS X, provide extensive controls over managed accounts, which are ideal for safeguarding vulnerable users such as children.
The Eclectic Light Company 