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Learn how to apply Bootstrap 4 see whats changed from Bootstrap 3 Ultimate Front end Framework for Responsive Design

https://www.udemy.com/bootstrap-4-tutorial-learn-twitter-bootstrap-responsive-web/?couponCode=expro

OT:

http://bestblackhatforum.com/Thread-Get-Bootstrap-4-Your-Responsive-website-design-just-got-easier

Bootstrap 5 is the current version and the linked course for V4 was last updated 12/2015 ??