We provide manuals or documentation for CANADUINO® developed products. For generic products, please make use of the comprehensive community support. Look at maker and tutorial websites. Check GitHub and forums. Google is your friend, but ChatGPT is your mentor and engineer.
Most products are not shipped with paper copies of instructions or manuals. Or not in your preferred language. Every smartphone can translate Chinese text into English, German, Spanish or whatever you prefer within a wink.
Use free and available technology and resources. It’s the 21st century.
The basics of electronics, like reading schematics, troubleshooting, or soldering is a prerequisite to work with DIY electronics. Like, when you want to drive a car, you need to book driving classes. The vehicle sales person can not teach you how to drive.