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 and finish dates. Automatically scheduled tasks are assigned an estimated duration and dates are automatically calculated.
3) Tasks can be linked to define dependencies between them using finish-to-start, start-to-start, finish-to-finish, or start-to-finish links. Linking tasks creates relationships that impact scheduling.