Besides using Actions and Conditions to create your Journey structure, you may also want to use a Flow, a function that allows you to add a delay to your journey funnel before it progresses to the next node, or to enroll / unenroll a contact from this or another journey (Fig 1). 

Fig 1

The possible Flow options are:

• Delay for a Period
• Delay until a Date
• Delay until an event
• Unenroll from THIS Journey
• Enroll in Another Journey
• Unenroll from Another Journey