I apologize, but I am not sure which lesson you covered column titles under.  I understand about not using spaces in the column titles, but can an underscore be used instead to separate words in titles of columns?

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Reply from Richard Rost:

Colleen, they're not "column titles." They're called FIELD NAMES in Access. Columns are what we call them in Excel. Access has Fields and Records. Excel has Columns and Rows. :)

Sure, you can use the underscore character. And remember, you CAN use spaces in your field and table names. I just prefer that you DON'T. You'll thank me when you get into advanced lessons.

I prefer to just capitalize different words in my field names, like FirstName. But you can certainly use First_Name if you want to.