An easier introduction I recommend is InfoQ’s “Domain Driven Design Quickly”, available in print or a free PDF ebook: https://www.infoq.com/minibooks/domain-driven-design-quickly...
I'm only about a third of the way through; I didn't realize that there was so much about properly building OO systems that I'd simply never seen in the wild, or heard of before.
An easier introduction I recommend is InfoQ’s “Domain Driven Design Quickly”, available in print or a free PDF ebook: https://www.infoq.com/minibooks/domain-driven-design-quickly...