Lesson 6 has this code
$fields->addFieldToTab('Root.Main', DateField::create('Date','Date of article'));
$fields->addFieldToTab('Root.Main', TextareaField::create('Teaser'));
$fields->addFieldToTab('Root.Main', TextField::create('Author','Author of article'));
DateField, TextareaField, and TexField are for Date, Text, and varchar respectively.
But what are the equivalent for the the rest of the fields types to use woth the addFieldToTab method? So for Boolean CompositeDBField Currency Datetime Decimal Double Enum Float ForeignKey HTMLText HTMLVarchar Int Money MultiEnum Percentage PrimaryKey Text Time Year, what to use?