How do I link a task in Project?

Once you’ve defined your tasks, you should next place them in a logical sequence by linking them together. The easiest way to do this is to click on a predecessor task, hold down the CTRL key and then click on its successor task. Then click on the Link Tasks button on the Standard toolbar so that the successor will be scheduled to start once the predecessor is complete.

By linking this way, you can quickly create your project’s schedule, confident that tasks will happen in the correct sequence, especially if tasks or milestones have multiple predecessors or successors.