In my city public transportation can either be faster or take a lot more time depending on where you're going. Also, it's not always as safe, you can get mugged. A private car allows you to carry stuff you couldn't other wise take with you when walking like say a big box, as well as get to and come from places in odd hours where there is no public transports running. So owning a car comes cheaper than using taxis often, for example. So even if you do own a car there will be a lot of times you will use the subway or buses, etc. It's not mutually exclusive. Here it's really normal for families to own multiple cars and it has nothing to do with status or socioeconomic positions. There are really cheap cars you can get on credit and people do that often, or buy used. Of course you see expensive ones as well but the point is the same. I think it's mostly convenience and safety.

Yes, that's a correct use. You'll hear people say "Indeed" or "Indeed it is" in your example. That could change depending on time, "It was a sad day" : "Indeed it was", and so on. Both alone or with the added are correct. Hope this helps a bit.

BConon's answer right there is on point, tho I understand how that is something you wouldn't say in english. So adding to her answer, a way to understand it would be... say a friend tells you something, one of them crazy stories and you know he's exaggerating things so you dfon't believe him and then you say "So? What about it?" to him, kinda sarcastically not acknowledging his incredible feat. That would be when in spanish you could use "Y eso qué tiene de increíble?" Or you could say it when he tells you a story like it's epic when it's really not, and then you would actually mean it, there's nothing incredible/amazing/epic about it. The "de" in the phrase is so the world "increíble" affects the word "eso", so "eso" is supposed to have been "increíble", it is the subject. "What's so incredible about that/it?" Hope this helps.

It is used a lot on business or school related events. For example "smart casual" would mean the dress code is not business casual, but just casual leaving it to your consideration; hence the smart part. So you can wear whatever you want as long as it fits in and it's not ridiculous or too casual, really depending on to the occasion. So in conclusion, the "smart" part means they leave it to you to figure out what would be appropriate to wear to such event/occasion/place, On a side note, there have been talk sometimes about "smart clothes", them being clothing with some technology element to it, maybe a small computer fit it that lets you listen to music or changes something for you (think Back to the future's jacket that would fit itself to you), or clothing that uses new kinds of textiles that would for example, adapt to the weather or rain. I do think it would be more common to hear about the dress code, but I leave both options since you didn't give much of a background on the question. Hope this helps.

Es más común que escuches "restaurante de 5 estrellas" para referirse a un restaurante de clase/game alta, justo como lo hacen con los hoteles. Espero esto te sea de ayuda.

It means the kid is smart; I still hear moms/grandmas say it now and then for sure, so yeah.

When I thought about how to answer this question I realized it probably seems really hard as there is not a real rule as to when to use which. I guess we just got used to it and know it by heart. I did however found something that might be of help to you. I don't know if we're allowed to paste links to other sites but here: http://www.spanishdict.com/answers/100035/para-and-por If it's not allowed please excuse me and this comment can be deleted. Anyway, hope that helps, it's more of a "Does this sound right?" kind of thing. Also the meaning can vary just by swapping them. "Lo hice por ella" and "lo nice para ella" both can be translated as "I did it for her" but one means "I did it for her cause I love her" (or alike) and the other means "I did it for her, because she doesn't know how to". It's really easier to just go check out that site than for me to try and explain this, it'd just end up being a full on 3 pages of examples and neither of us wants that hehehe. Good luck and hope it helps.