1) Projects involve creating tasks to be completed within a specified time period. Tasks can be manually or automatically scheduled depending on project needs. 2) Manually scheduled tasks allow full control over duration, start date, and finish date. Automatically scheduled tasks are assigned an estimated duration and automatic dates. 3) Tasks can be linked to define dependencies between them using finish-to-start, start-to-start, finish-to-finish, or start-to-finish relationships. Linked tasks update dates based on predecessor tasks.