Resolved questions
what's different between socialism and communism ? and Russia in past was socialism or communism ?

С точки зрения Ленина на смену капитализму неизбежно должен прийти коммунизм как общественно-экономическая формация. При этом сам коммунизм делится на две стадии. Первая - социализм. На этой стадии ещё сохраняются некоторые классовые различия в обществе (рабочие, крестьяне и интеллигенция), а также осуществляется принцип "От каждого - по способностям, каждому - по труду". Социализм тоже делится на некоторые этапы: диктатура пролетариата, построение основ социалистического общества, построение развитого социализма. Вторая стадия - непосредственно коммунизм. На этой стадии все классовые различия должны быть стёрты и должен осуществиться новый принцип: "От каждого - по способностям, каждому - по потребностям".

Согласно Конституции СССР и программных документов Коммунистической партии Советского Союза СССР (включая Россию) находился на стадии "развитого социализма" и постепенного перехода к коммунизму.

The Communist Party of the Soviet Union emerged from the Bolshevik faction of the Russian Social Democratic Labour Party, under the leadership of Vladimir Lenin. The party led the 1917 October Revolution that overthrew the Russian Provisional Government and claimed to have established the world's first socialist state.

Given the central role under the Constitution of the Soviet Union, the party controlled all tiers of government and social institutions in the Soviet Union. Its organization was subdivided into communist parties of the constituent Soviet republics as well as the mass youth organisation, the All-Union Leninist Young Communist League (Komsomol) and, for children, the Young Pioneer organization of the Soviet Union. The party was also the driving force of the Third International (Comintern).

The party ceased to exist after the coup d'état attempt in 1991 and was succeeded by the Communist Party of the Russian Federation in Russia and the non communist parties in some of the now-independent former Soviet republics like the Baltic States.[ Wikipedia]

Socialism is the theory that the working class, the class that produces the profits, the wealth, the cars, houses, planes, steel, should take over and run things collectively, democratically, for the benefit of the majority of people.

Communism is the idea that society should not have classes - exploiters and exploited, oppressors and oppressed, and so on. "

Socialism generally refers to an economic system, while communism refers to both an economic and political system.
Socialism seeks to manage the economy through deliberate and collective social control.
Communism seeks to manage both the economy and the society by ensuring that property is owned collectively, and that control over the distribution of property is centralized in order to achieve both classlessness and statelessness.
Both socialism and communism are based on the principle that the goods and services produced in an economy should be owned publicly, and controlled and planned by a centralized organization. Socialism says that the distribution should take place according to the amount of an individual's production efforts, whilst communism asserts that that goods and services should be distributed among the populace according to individuals' needs.[ information from various net sources]

Russia was a part of the Soviet Union and when I was a schoolboy I remember that they said about the developed or advanced socialism in the Soviet Union. The communism was a an object then that was supposed to be built in the future because the communism was being built. I think that the years of socialism were the best years in the history of my country.