Unfortunately, there isn't a "specific" course that covers If-Then statements in general.  It's kind of scattered through out the courses.  The branching statements are typically used in VBA not in a query.
The  IIF Function would be a bit better suited to a query.

Can you give us a better idea of what you are wanting to do?  Examples and screenshots help a lot in guiding you.
Or is this just a topic you want to more about in general?

I think I got the answers to the last two questions I had. I was ever so grateful! I was looking for additional training materials. I was hoping to find something that would teach me some of the basic Query IIf functions.

Teri if you look up the definition of query you will find that a synonym is question.  
Quite literally you are asking questions of your data.  

What is the largest...?  When was the last...? How many are there?

Once you have this "thing" called a database, which is just a collection of specific pieces of data, you start asking questions of it to make better decisions or accomplish a task - Such as billing a customer.

In the case of Access Queries, it is a request for data results (a filter so to say), usually so you can perform an action on that data. You can use a query to answer a simple question, to perform calculations, to combine data from different tables, or even to add, change, or delete table data. ... Queries that add, change, or delete data are called action queries.

That is why there isn't a specific lesson on "Queries".  Once you have the data accumulated, all things you are doing become a query in a sense.

Where you go from here is up to you. I recommend you keep going with the courses, as it appears you are.
Focus on learn the next "thing".
I'm always amazed that for how much I've learned - how much I don't know.  LOL
I think some of the people here (Richard, Alex, Adam, Kevin) have forgotten more than I ever knew about Access.
It's not always about the end.  Sometimes it is about the journey along the way.

Thank you for the information. I agree the journey is the fun. I have had so much fun trying to learn access some nights I find myself losing track of time and never get to bed. LOL, now that is sad. I can't thank you guys enough for taking the time for people like me. I really have learned a lot.