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A constructor "constructs" an instance of a class.

I'm not sure what "automatically" and "special type" mean. Leaving those out says this which is about correct:

A specific constructor receives args to define an instance of the class.
A class can have many constructors.

Yes.

The Object class is the super class for all classes.

I think the word implicit is used in its normal English language way.

If you move around in the tutorial a bit you can find other articles:
Providing Constructors for Your Classes (The Java™ Tutorials > Learning the Java Language > Classes and Objects)

A...

Are you asking how to code the call to a class's constructor?
See the tutorial: Passing Information to a Method or a Constructor (The Java™ Tutorials > Learning the Java Language > Classes and...