The National Bar Exam Union introduces principles of community property law for exams.
Always keep in mind that the problem you are required to solve in this area of law is: at final separation with no intent to come back together (reconcile), who gets what? Who gets reimbursed for what? Who pays what debts or judgments?
The answers usually come out of rebutting the community property/community liability presumption. Other times it comes from supporting it.
In other words you are solving the money issues that come with separation and divorce.