Custom Development - Best Documentation/Tutorials for nopCommerce 3.80?

I'm evaluating the nopCommerce platform (version 3.80) vs a Magento implementation that is currently "stuck" in development.  I really love all the out of the box functionality of nopCommerce and feel that it is a strong candidate to replace Magento for my company.  The part where I'm stuggling is the lack of documentation around Custom Development (I'm new to asp.net and nop, so that doesn't help).  It seems like a lot of the documentation around custom development could be for previous versions of nopCommerce.  So, to make sure that I'm using the correct approaches for version 3.80, I was hoping that somebody could point me to the best documentation for 3.80.  Here is a list of some of the customizations that I'd need to be able to do:
-  Extend core entities, beyond what can be done with Custom Customer Attributes (like Customer)
-  Modify and/or replace existing Admin Views (like Customer List and Customer Edit)
-  Add new Admin Views
-  Modify button behavior (for example, I want the "Add To Cart" button to bring up the Quick View in some situations)  
-  Interface with external system(s) (for example, I need the customer and order information to flow to our back office routing/fulfillment system)
-  Modify and/or replace existing Customer Facing Views
-  Add new Customer Facing Views
...

Check this: http://docs.nopcommerce.com/display/nc/Developer+Guide

Along with the documentation link that Eduardo posted above, you may find these articles helpful too:

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Beginner's Guide to nopCommerce Theme Development (ASP.NET MVC Based e-Commerce Solution) – Part 1


Beginner's Guide to nopCommerce Theme Development (ASP.NET MVC Based e-Commerce Solution) – Part 2


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Thanks for the quick response.  I'll take a look and report my findings.

Thanks for the detail answer, one more thing I need to add custom pages in nopCommerce, e.g. I need to add new pages, related classes and database accordingly add into ACL, logging for school management system, where I can learn the custom development in nopCommerce, let me clear one thing that I have seen the documentation but it could not help me a lot.

An early response is requested.

Thanks in anticipation.