i will try to put what highalectical said in simpler terms, and starting pointing out that this discussion is very very important to new people.

so, how communism itself will look in the future will be determined by the material conditions of the future, since we are not there yet, we can’t say for sure, only speculate. but you can say you dream of a society that has x characteristic.

the same goes for socialism itself, how its gonna look for each country, will be determined by said country, for good or bad. that is why soviet socialism is different from chinese, that is different from yugoslavia, that is different from korea and so on.

but if we take all of those and try to dawn similarities, we can note a certain tendency, and that tendency is a uplift on quality of life, like the other comrade said in another comment, drastic reduction or extinction of illiteracy, full employment for long periods of time, agrarian reform, reduction or extinction of homelessness and so on.

and why that discussion is important, there are some revisionists line that throw materialism out of the window and create an abstract form of socialism, and they use that abstraction to shit on former socialists and current ones, for example abolition of family and moneyless economy, no socialist country ever came close to both of these, so these lines spew that there was never a “true socialist country”, all were horrific oriental despotism dictatorship and etc.