The list of 'keyword' you must known

1. friend -- Grant non-member function access to private data.
2. inline -- Optimize calls to short functions.
3. namespace -- Partition the global namespace by defining a scope.
4. new -- Allocate dynamic memory for a new variable.
5. static -- Create permanent storage of a variable.
6. template -- Create generics functions.
7. this -- A pointer to the current object.
8. using -- Import complete or partial namespace.
9. virtual -- Create a function that can be overridden by a derived class.