In a "Free" field you can put any data you like, tekst, numbers etc.
In a "Numeric" field you can only put numbers (1, 2, 234, etc).
In a "Boolean" field you can only put True of Fals (like yes or no). There is lots of info about working with boolean variables on the internet.
vBulletin default are the settings that come with the vB package. When you install vB all options have a setting, that's called the default setting. Offcourse you are free to change those to your liking.
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