Planning activities minimizes the risk of variability, because planning provides clear picture of your next step. Also planning reduces the possibility of overlying actions between members, because you need not leave space for activities.
Activities menu in Odoo helps to access and manage your activities.
By clicking on Schedule An Activity from chatter, you can plan and manage activities.
You can set your activity types from Settings ‣ Activity types. By default there are number of activity types available in Odoo.
The flow of activities can be planned by setting Recommend Next Activities.
Once you complete the activity and click on Done & Schedule Next, the recommended activities will be suggested to you.