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Practice materials are a subset of secondary sources. While many secondary sources explain the law on a more hypothetical level, practice materials provide instructions, checklists, and forms to help with the actual practice of law - filing complaints, drafting contracts, etc.
American Jurisprudence Proof of Facts 3d is an example of a practice material source. It contains detailed information on how to handle a variety of specific legal problems. The book/online database explains potential causes of actions/defenses and provides practitioner checklists, sample pleadings, and sample interrogatories, among other things."
Example
85 Am. Jur. Proof of Facts 3d 1 provides comprehensive information on how to handle a case regarding landlord liability for injuries caused by a tenant's dog.