This video explains 'How to Create Activity Types in Odoo14 Community'. When you plan activities you minimize the risk of uncertainties, as you provide clear directions for the course of your next action. In addition to that, you do not leave space for wasteful activities and reduce the chance of having overlapping actions between team members.
So you get reminded of what needs to be done and schedule the next activities to undertake. Odoo helps you to easily plan your usual flow of activities