What is this keyword in java?

What are the main uses of this keyword?

Can we assign the reference to this variable?

Can this keyword be used to refer static members?

How can constructor chaining be done using this keyword?

What are the advantages of passing this into a method instead of the current class object itself?

What is the Inheritance?

Why is Inheritance used in Java?

Which class is the superclass for all the classes?

Why is multiple inheritance not supported in java?

What is aggregation?