Schedule Flow
Schedule Flow allows flows to be run on a schedule. A cloud flow could be created that performs one or more tasks such as reporting in emails.
The schedules could be run- Once a day, once an hour, or a minute. It could be run on a date that you specify, or after several days, hours, or minutes that you specify.
If you want to create a flow that runs every day at 9:00 AM, Schedule Flow is your new bestie.
Manual Flow
A manual flow is partially automated. One can manually run the flow by choosing the drop-down button and running from the drop-down.
This then brings up a pop-up box where one can select items one wants that flow to run on.
Automate Flow
The solution aware flows created within the solution using in-built connectors that act as regular triggers formulate automate flows.
An Automated Flow is recommended when you want a flow to run whenever specific conditions are met, depending on which type of Automated Flow trigger you choose.
If you want to create a flow to run whenever a user creates a new item on a SharePoint list, you will create an Automated Flow with a “when an item is created” trigger and specify which SharePoint list.