how do developers learn from the docs ?

i have been in the web dev field for about 2 + years when i want to learn a technology node js for example i would get a course or read a book every time i try to learn from the docs i would find it almost impossible to implement anything i learned in a real world app or even build one ,the docs doesn't explain how to use that knowledge in a real world app or even give examples on how to do so i wonder how do other devs who make the courses or the books know how to build apps and do stuff just learning from docs ?
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