In Odoo there was gantt view available in v8 and before but in v9 onward it is not available any more.
Gantt View is very helpful if we want to schedule multiple works easily. Mostly in long-term project's work scheduling it is very useful to avoid conflicts and overlapping of work. Perfect work sheduling can give you better result and project can be completed in time.
In gantt view you can drag and shedule your works to avoid overlapping. you can add new records also directly from gantt view.
Project gantt view related fields in form view
Task gantt view related fields in form view
Odoo Gantt view on Project & Tasks
Just install this module to add gantt view on Odoo project and tasks views. Not any extra configurations required.