All the tutorials I find are about finding and installing libraries. But what do I do once I have it? Where do I find a manual for any given library? How do I know, how to write the code. What are the functions, etc. Are there no comprehensive manuals attached to libraries?
the majority of libraries have a documentation section and come with example code which you can access via the File>Examples menu of the IDE
what microcontroller are you considring using?
any idea of a project specification?
Whether or not there are tutorials on how to use a library depends mainly on the author of the library but the quality of documentation varies.
What you will usually get are examples of its use and, of course, you have the source of the library on your PC which you can examine
What I find useful is to look at the examples. make them work as they are then experiment with changes to them
A search of the forum often finds more details and YouTube is also worth searching
Could be because writing code is fun, writing and maintaining documentation isn't ... especially when you're not getting paid to do it 
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In the library. As an old salt said, "Find the library you like, then find the hardware using it."
Examine the example files in the Examples folder.
Examine the .CPP and .HPP files (and look in the Examples folder)
No.
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