Create dependencies between tasks to show the following the following scheduling rules:
Start-to-Start - The tasks must began at the same time.
Finish-to-Start - The first task must be completed before the second task can start.
Finish-to-Finish - The tasks must complete at the same time.
Start-to-Finish - The tasks must begin before the second task starts.
Steps
Navigate
to Planner.
OR
Navigate to Planner with
Selected Project.
The Planner opens.

Select the end of one task by clicking and holding the mouse button.
Drag the cursor to the beginning
of another task until the green check mark (
)
appears.
Notice the dotted line between the two task with the message stating,
"From: Task #2 - End
To: Milestone Task - Start"

Release the mouse and an arrow
appears from the first task to the second task.

OR
Add dependencies in the Task Information
dialog box and adding dependencies in the Dependencies
tab.