I have found this website Code Vizion dedicated for SugarCRM learning, development and customization.
I would venture to say that the whole post could be removed as outdated. Many of these suggestions were made back when 7.2 was first released and many may be outdated in view of 7.7
The you tube videos were probably removed by their owners.
Mehul Bhandari - from what Francesca Shiekh posted above, it looks like that video may now be under http://code.tutsplus.com/categories/backbonejs, but I do not know exactly which video it was supposed to be (maybe http://code.tutsplus.com/tutorials/getting-started-with-backbonejs--net-19751?).
Francesca - Do you know if this video is available anywhere else? If not, I can remove the reference to it in the original post. Thanks!
Hi Alex Nassi
Vedio not available for backbone
For backbone, there are also video on pluralsight:
Underscore.js Fundamentals | Pluralsight