Sorry you have asked this question twice or perhaps thrice.
Sometimes I do ignore the posts if they are not related to the topics that are already covered. The purpose of the forum is to let members clarify confusions/questions they have about what they have learned in the lessons. Please keep that in mind. Thank you for your understanding.
To answer to question briefly the value "Supplier" would restrict the account to be used in supplier related transactions. The value "Yes" would let this account be used for both "Suppliers" and "Customers". I will talk more on this once I am back to AP, AR, and CE videos after finishing first round of EB-Tax.