Grammar

Nouns declensions:

	Masculine	Feminine	Neuter
Case	Sing	Pl	Sing	Pl	Sing	Pl
Nom	стол	столы́	ры́ба	ры́бы	вино́	ви́нa
Acc	стол	столы́	ры́бy	ры́бы	вино́	ви́нa
Gen	столá	столóв	ры́бы	рыб	винá	вин
Dat	столу́	столáм	ры́бe	ры́бaм	вину́	ви́нaм
Instr	столóм	столáми	ры́бoй	ры́бaми	винóм	ви́нaми
Prep	столе́	столáх	ры́бe	ры́бaх	винé	ви́нaх

Stem-ending consonants that affect the ending:
If the stem of a noun ends with the sibilants ж, ч, ш or щ, or the velar consonants* г, к, or х, the ending ы is never used as an ending; instead и is used. Eg.
пасса́ж => пасса́жи (passage [of text])
врач  => врáчи
Мáшa => Мáши
товáрищ => товáрищи (comrade)
кни́га => кни́ги
уро́к = > уро́ки
во́здух => во́здухи
* a velar consonant is articulated with the back of the tongue held close to or touching the soft palate

Prepositions:
+ accusative:
в (во)		=	in, into, to (always involving movement)
на		=	onto, on (always involving movement)
чéрез		=	through, across, over

+ genitive:
без		=	without
для		=	for
до		=	up to; until; before
из		=	out of
из-за		=	because of
крóме		=	besides, except
óколо		=	near, about/around (as in approximately)
от		=	from, away from
пóсле		=	after
прóтив		=	against
у		=	at the house of; meaning to have when followed by (pro)noun

+ dative:
к (ко)		=	towards

+ instrumental:
мéжду		=	between
с (со)		=	with

+ prepositional:
в (во)		=	in, at (no movement)
на		=	on, in, at (no movement)
о (об)		=	about, concerning