Packt is a publisher of programming books and video courses and there are quite a few Delphi books published through their platform. They are running a sale right now where you can get each e-book (and video course) for $5 each. There are at least 9 books (most of them pretty recent) related to Delphi for sale through their platform including just published books like “Delphi GUI Programming with FireMonkey by Andrea Magni”. In addition to the books are there video courses from people like Muminjon Abduraimov who is a frequent contributor to the Embarcadero Blog. It is unclear when the sale will end. They have sales frequently though and even once the sale ends these are some powerful books to really teach you the ins and outs of mastering Delphi.
Delphi GUI Programming with FireMonkey
By Andrea Magni
Mastering Delphi Programming: A Complete Reference Guide
By Primož Gabrijelčič
Delphi Programming Projects
By William Duarte
Delphi High Performance
By Primož Gabrijelčič
Hands-On Design Patterns with Delphi
By Primož Gabrijelčič
Delphi Cookbook – Third Edition
By Daniele Spinetti , Daniele Teti
Delphi Cookbook – Second Edition
By Daniele Teti
Delphi Cookbook
By Daniele Teti
RESTful Services with Delphi [Video]
By Gordan Paunovic
Free eBook – Expert Delphi
By Paweł Głowacki
Mastering Delphi [Video]
By Muminjon Abduraimov
Delphi Solutions – Part 1 [Video]
By Daniele Teti
Working with Delphi [Video]
By Paweł Głowacki
Delphi Solutions – Part 2 [Video]
By Daniele Teti
Head over to Packt right now and check out all of the books about mastering Delphi for only $5 each.