No there isn't any offline center. But you have any question/confusion/doubt. Here is the link to join telegram group. Send in your questions t.me/joinchat/M3L5OlKYSFayZvvHJWlivw
Please watch thks video, here I have discussed important transannular rearrangement reactions ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-wLXuHIrNvsU.html I will look for more examples to update the content. Cheers. Have a nice day.