I would start, though, with the official documentation: https://kivy.org/docs/gettingstarted/intro.html
Then went seamlessly into Google (preferably in English, but it is possible in ru-segment). For example, the first results gave a fairly good article: https://habrahabr.ru/users/heattheatr/posts/
Well, where do without videosecu. Utube like https://www.youtube.com/results?search_query=kivy+...
Also, the project has a great wiki on github: https://github.com/kivy/kivy/wiki