We have a different number of tickets on different days. How to configure that?

Add an additional rule to the resource. Learn how to do this here.

You will now have two rules. Decide which rule should have a different number of tickets. Open the settings form for this rule and enter the required Total share count value.

Next, click the intersection of this rule and the price option. In the form that opens, specify the desired Share count for the price option.

Your configuration will look like this:

See this example in action: