the basic case aka nominative
Basic because it was the first one I learned/the one present in the dictionary/the default one.
It names things. Or, is the subject of a sentence.
Like everything in Russian, there are forms for everything (pronouns, nouns, names, adjectives) and they have gender (masculine, feminine, neuter) and number and for whether it is hard or soft.
hard ending is null/nothing
for masc and fem with a hard ending: магазины/карты
masc/fem, soft ending: словари/тёти
Yes, the windows does look like a singular feminine noun. This isn’t the only case to do this.
ending is ый, or ой, or ий
I’m not explaining the reasons for the different endings. Maybe I’ll come back and do that later.
Yes, these change with cases. It does suck. See how the alphabet is the easy part.
ты- you (informal, singular)
он/она/оно- he/she/it (neut)*
твой, твоя, твоё, твои- your
его, её- his/hers (these are nice, they don’t change)
наш, наша, наше, наши- our
ваш, ваша, ваше, ваши-your
их- their (same with this one)
I think this is all for nom (except for the adj). If I didn’t include it, I don’t know it.
*gender applies to things, a hotel (гостини-ца) is a she, not an it, because it is feminine