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But rel=canonical is offered only for search engines to learn whether the page is a duplicate or an original. Maybe there's someone else that could tell their experience about this topic?

As I have seen somewhere that underscore "_" unites the names and Google looks at it like one word with no spaces. Wouldn't it be bad for long product names? example.com/2010_chrysler_grand_voyager_2l would be the same as write example.com/2010chryslergrandvoyager2l ?

All else being equal, I think it's very similar - you're just diluting your unique keywords. The only exception would be if the phrase "cheap 2012 honda accord" is very high volume. Then, you might want to target that on the page. I'd be selective about that, though - don't just add it to every URL. Unfortunately, "cheap" is just one of those words that looks low quality to Google, because everyone is chasing. So, I think you have to be all that much more careful. If you sold only used cars and you wanted "used-" ("used-2012-honda-accord", for example) in your URLs, that might be different. I'd still proceed with caution, but at least "used" would be a meaningful aspect of your business and the user experience. "Cheap" is a value judgment that everyone wants to claim.

This depends on your target requirements. If you want to target Sony followed by generic terms then you go with domain.com/sony/abc-product or if you want to target generic terms then you go with domain.com/abc-product/sony Keeping the targeted term close to the root domain will have slightly better chances to rank compared to being away from the root in some sub-directory. And again other factors like the link profile of that page also matters a lot. So you try to earn more quality links to which ever page you want to rank for. So you first decide upon your targeting strategy that may depend on search volumes of the search terms and the commercial intent behind these terms etc. Regards, Devanur Rafi

So basically it's better to keep those parameters, but show only less of them where possible. It answered my questions 4) and 6). Another thing is whether putting a (category or brand) word next to domain is better than on the end of a URL? (i.e. domain.com/sony/tvs or domain.com/tv/sony) Which one would get higher result on SERP "tv" or "sony" in both cases? Or maybe they both serves the same? And the final is what good or bad could happen if someone put the same keyword in all site's URL's? (i.e. I would be selling cars and my domain isn't included any word cars, so i put all of my pages in one folder like domain.com/cheap-cars/etc)