Are days of the week capitalized in Polish? What about months?
Unless we're talking about the days of the Holy Week, which are named Wielki/Wielka (Great) and capitalize the name of the day. Some other holy days that have the day of the week in the name are capitalized as well.
Which nouns are capitalised in Polish?
Well... proper names, words for nationalities, some religious things or ones that need great respect... also it's good to capitalize forms of "you" when you address someone direclty.
Do the names of the week have any meanings? Like mo(o)n-day or sun-day?
poniedziałek - after Sunday
wtorek - second day (not the most usual wording)
środa - in the middle of the week
czwartek, piątek - the fourth/fifth day
sobota - Sabbath
niedziela - no work (also not the most usual wording)
Thanks, good to know- took a screenshot of this post.