SGK's honest review, Allen iOS Concurrency - Understanding DispatchQueue and OperationQueue course

It's been a while since I've heard such a high-quality lecture. It was a difficult topic, but I was impressed by the part where you explained it easily with images. I was disappointed that this lecture wasn't discounted when other lectures were discounted, but after completing the course, I think it's natural. Thank you for sharing good knowledge, and I hope you continue to prosper.

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