does great works happen automatically when you build wonders, I don't quite understand great works I'm afraid.
Culture bomb basically is, + extra culture (so you can buy extra policies)?
great general still is doing the border pops with citadels right?
I don't even understand tourism in this game, what benefits does tourism give to you?
I can understand culture, extra culture -> better policies -> more and better bonuses in hammer, food, gold, beakerrs, but what about tourism?
Only one Wonder comes with a Great Work (the Parthenon)
Great Works are otherwise only created by the use of Great Artists/Musicians/Writers, burning them to provide a Great Work instead of their special ability, or by using archaeologists to dig up artifacts at antiquity sites (available once you research Archaeology).
Great Works are things that are held inside a 'Great Work slot' in certain cultural buildings and Wonders. You need an empty slot of the appropriate type in order to create a Great Work. Great Works all provide 2 culture and 2 tourism each, no matter what kind they are. A building or Wonder that has more than one Great Work slot will also have a theme bonus - fill up the slots following the appropriate guidelines (for example, 'All works from the same civilization but different eras') and you'll get a Culture and Tourism bonus.
There are two basic ways to gain Tourism. The first is through Great Works and theme bonuses, as described above. The second is with hotels and airports. Hotels and Airports (and the National Visitor Center national wonder) both turn all culture provided by any wonders you've built into Tourism, as well as any culture provided by Improvements (like the French Chateau) worked by the city, but not culture provided by regular non-Wonder buildings.
You can think of tourism as a resource: every turn, your Tourism amount is applied to each civilization you've met. When your Tourism builds up enough that you've given a civilization more Tourism than they have produced Culture throughout the game, you are considered Influential with that civilization. Become Influential with every civilization and you win a cultural victory.
There are levels of influence below Influential, and this does have one other effect in the game once the civilizations start choosing Ideologies. If you have some cultural influence over another civilization and you follow a different Ideology, they will lose happiness based on how influential you are over them, and they may eventually be forced to change their Ideology to match yours.
edit: There are a few things in the game that do replicate tourism -> money, like moai gold or Neuschwanstein, but otherwise tourism is separate