Standard references
Please refer to these standard references for the Russian language.
1. The Russian Language Institute. Link: https://www.ruslang.ru/onlayn-resursy-irya-ran
2. The knowledge portal GRAMOTA.RU. Link: https://www.gramota.ru/
When in doubt about a rule, try searching in their extensive Q&A section: http://new.gramota.ru/spravka/buro/search-answer/?s= by
3. The rules of Russian grammar and punctuation by D.E. Rozental. Link: http://old-rozental.ru/
Other good sources
Other useful resources to use when translating into Russian include:
4. Classic and context online dictionaries: MULTITRAN: https://www.multitran.com/ REVERSO: https://context.reverso.net/ LINGUEE: https://www.linguee.ru/
5. Thesaurus KARTASLOV: Map of words and expressions, helpful when looking for synonyms and checking rules of usage. Link: https://kartaslov.ru/
6. Acronyms: https://www.sokr.ru/
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