Being an effective software architect means understanding the domain of the software you are building. Gaining knowledge of general business topics and a deep understanding of the organization's business is the foundation for becoming an expert on the problem space for which you will be designing a solution.
DDD is a proven approach to modeling a domain. Creating a ubiquitous language that will simplify and facilitate communication between everyone involved in the software project, and working with domain experts, will facilitate learning a particular domain.
Other practices, such as separating your domain into subdomains and creating bounded contexts in your domain model, will minimize complexity and allow you and your team to firmly grasp even complex domains.
One of the keys to building software successfully is proper requirements engineering, including knowing...