3. Resource schedule: You create one or more 'resources' which your users can book whenever they are available. Each resource can only be booked once. Example: Your clients can pick a time to come see you within the business hours you set Example: Employees can sign up to use a meeting room whenever it is free
4. Capacity schedule: You create 'slots' in the schedule and your users can sign up for those slots. You can allow multiple bookings per slot. Example: Students can choose a class and sign up until it's full Example: People can sign up for an event you are hosting