The advanced tag on a blog post means the article is meant for readers who are familiar with the subject. It also means that they are able to understand the technical terminology that is required in that field. Usually when a blog post has advanced difficulty tag, it means that there’s another article with beginner or intermediate tag that serves as an introduction. Than you should read that one first. There will also be a link going foreward and back with these articles that are written in a series.
Bot dialog cancellation and interruption is used to expand you bot's capabilities in waterfall dialogs in Bot Framework SDK bots. They are meant to enable you to quit your dialog if you don't want to finish it or to create custom interrupts to, for example, call for help in the middle of a dialog if you don't know how to proceed.