2021
https://dev.to/hem/oauth-2-0-flows-explained-in-gifs-2o7a
    ! good animations
2020
https://habr.com/ru/company/dododev/blog/520046/
https://gravitational.com/blog/everything-you-need-to-know-about-oauth/
    https://proglib.io/p/vyydi-i-snova-zaydi-tolko-pravilno-vse-li-vy-znaete-ob-oauth-2-0-2020-07-30
2019
https://itnext.io/an-oauth-2-0-introduction-for-beginners-6e386b19f7a9
2017
https://developer.okta.com/blog/2017/06/21/what-the-heck-is-oauth