String - A sequence of characters, actually an array with start and ending pointers, but donÂ't bother, it is quite hard to understand without programming experience
Array (Vector) - A collection of values "Group[1]" is a value. Group[] is an array. Within Group[] you can store values to dereference later.
Int (Integer) - What it says, an integer value
Float - A float value, 2.12 is a float. 2 is an integer.
Char - Character.
Bool (Boolean) - A Boolean value, True or False.
If you need any more help or need more explanations, tell me.