Q2: Is TKDTutor a complete resource for all TKD patterns?
No, and there is probably no site that does. I list a lot of the various TKD pattern sets, but I specialize in the Chonji /Changhon pattern set. Even those patterns have been changed by different organizations. Everyone wants their 15 minutes of glory so they “reinvent” a pattern or a martial art and then claim it to be new and innovative. When in Rome do as the Romans do. Whatever art or organization you are specializing in at the time; concentrate on perfecting its patterns.
Q3: What is the significant difference between ITF VS. WTF?
I write more about this in various areas of TKDTUtor.com Basically, the difference is a power struggle between two politically motivated organizations; each claiming to be the true representative of TKD. The WTF is Korean controlled, uses a different pattern set, and has changed its version of TKD to a crowd-pleasing Olympic sport. In an effort to nationalize TKD and make it unique, they made it kicking art where the competitors look similar to river dancers, only moving their feet with their arms hanging at their sides. The ITF stays more with the traditional roots of TKD and is more international in that it is not controlled by one country, but it as it own power struggles and weird ideas.