What are Actions?
An Action is something you want to perform in one of your apps. For example, creating a new contact in your CRM or sending an email.
In a Bot, everything defined after the Trigger Event is an action.
How are Actions counted?
If you have a Bot like the one below:
Triggers on New Row in Google Sheet, waits for 5mins and sends an email - this Bot has 2 Actions.
It accounts for 2 Actions each time it is run i.e, if this Bot runs 10 times in a billing cycle, it accounts for 20 Actions in your action quota.