it was very useful i further understand the basic concept of oop clearly . he told interesting example for that concepts that were unforgettable . and aslo he taught about diagrams such as state diagram , class diagram etc , very well and also very interesting things in lecture are he told his experience about his studies and his teaching experience and also he gave many e - resources and book for references . thank you sir for your great lecture , p.s - i expect your lecture in future !