Sales (3 hours) (in some years) deals with the sale of goods under Article 2 of the UCC and Payment Systems (3 hours) (in some years) deals with negotiable instruments (checks and promissory notes) under Articles 3 and 4. Secured Transactions is a foundation course normally taken by 3Ls. Secured Transactions may not be taken in addition to the 4-hour course, Sales and Secured Transactions, which is occasionally offered.
Bankruptcy and Secured Transactions cover some common topics, but a student may enroll in both courses. Bankruptcy is not a prerequisite or co-requisite for Secured Transactions. Bankruptcy and Secured Transactions cover some common topics, but a students may enroll in both courses. Bankruptcy is not a prerequisite or co-requisite for Secured Transactions.
There is little significant redundancy in the related courses of Bankruptcy, Sales, and Payment Systems, which may be taken in any order or combination.
Due to my course materials that treat commercial law as an integrated system, secured transactions does overlap with bankruptcy. However, it is fine to take both courses, and to take them in any order or concurrently. Although the school labels secured transactions "core" and bankruptcy "non-core," bankruptcy may be a more useful selection for some students who plan to take just one. Please feel free to talk to me if you'd like to compare these options in your circumstances.