relate to, concern, be connected with, be linked to, pertain to, be associated with, have to do with, bear on, be relevant to, be in connection with
instruction books - user guides - handbooks - guidebooks - operating instructions - instruction manuals - reference guides
Manuals are structured documents that provide detailed instructions, explanations, and guidance on how to use, operate, assemble, or maintain a product, system, or service. They are typically organized in a clear, logical format with sections, headings, and step-by-step procedures to help users solve specific tasks or problems. Manuals can be printed booklets, PDFs, or online resources, and often include diagrams, screenshots, and safety warnings. They are essential for ensuring correct and efficient use, reducing errors, and supporting troubleshooting. Manuals are widely used in areas such as technology, machinery, software, consumer electronics, and household appliances.