This is a website of someone known as szeraja_zhaba from Duolingo.
On Duolingo, I answer a lot of questions about Russian (and some about Ukrainian) — I’ve written over 4000 forum answers. Duolingo allowed downloading message archive thanks to that new cool GDPR law, so you can have an archive of all my messages: szeraja_zhaba-posts-2018-06-14.csv. All the answers are available under the CC BY 4.0 (Creative Commons Attribution 4.0 International) license.
If you have any questions, my Mastodon account is @email@example.com.