I have always been very interested in wine. Sometimes I get to drink those nice exp wine. And sometimes those cheap wine that is super sour.

Well, I know nothing about wine. But I know it's cheap when it's SUPER sour with no sweetness in it. But I'm really interested to learn about them.

So how do people usually categorize their wine? If can, state some brand which is consider cheap, middle, and top end wine. How much would cheap, middle and top end usually cost? I know there's a big range, So just a brief idea.

Also, how do you guys differentiate between good and bad wine. Is it like how I categorize mine? Super sour, sweetness etc? Do guide me.
Guys, please do provide any form of knowledge I could use. Really would like to learn more about them.
RED WINE! NOT WHITE! Sorry! I missed this out. I'm sort of interested in only red wine only so far. I know red meat should match with red wine. And fish with white. But yeahh. My post was referring to red wine.