It seems to be well-made so that even beginners can understand Java. I looked around for free Java lectures, but there were no lectures that were easily explained, so I looked for an easy lecture and found this lecture that costs 50,000 won but is worth the price. I paid for it and am taking the lecture with great determination. I give it 5 stars because it seems to explain well the content that I didn't understand in other lectures!! Thank you for the great lecture!!