Holodomor is Nazi propaganda. There was a famine in that time, it was bad, and the Soviets did their absolute best to address the situation. Notably that was the last famine in the regions comprising the USSR, compared to the tsarist era when famines occurred every few years.

https://historynewsnetwork.org/article/169438

In terms of what the USSR accomplished, here's a thread collecting many sources. https://lemmygrad.ml/post/1066

Blackshirts and Reds is an easy read that's recommended on here to no end, and for good reason.