Tasks in the projects section

Tasks in the projects section

Hi,
In the Projects section and in the task tab, I want to create three tasks named task1, task2, and task3 so that all three tasks are closed at first. When task1 is in Resolved status, task2 will be in open status automatically. Also, whenever task1 is open, task3 will be automatically open 5 days later. How can I do this?
Thank you for your step by step explanation.

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