You need to build your three guilds first of all, all of them generate culture and great people points when worked by specialists. Great Writers, Artists and Musicians all create Great Works of Art, which yield +2
Culture and +2
Tourism when placed somewhere in your civilization. These Great People can also be bulbed, instantly granting 8x your current Culture output, a Golden Age, or 8x your current Tourism output when used in competitor's land, respectively.
In Buildings and Wonders with more than one slot, you get an extra +1 culture and tourism for every great work placed in the building, if your works meet the requirements for its Theming Bonus. Finishing Aesthetics doubles this bonus. Various other policies and UA also help with CV.
Hotels and Airports convert 50% of culture from World Wonders, Great Works and Tile Yields to Tourism.
National Visitor Center converts 100% of culture from World Wonders, Great Works and Tile Yields to Tourism.
Researching Internet doubles your tourism, so does contributing the largest amount of
to the International Games.
If your lifetime Tourism influence on every other Civ is higher than every other Civ's lifetime Culture, you win. Check the game for which factors determine how much your Tourism Per Turn influences other Civs, diplomats only help in Civs which have a different ideology from yours.