Catherine the Great is set to be “Creative” and “Financial”.
“Creative” means you have +2 culture in each city per turn. This will lead to your territory (defined by “Cultural borders”) growing rapidly and can save you building obelisks in your cities. Theatres are built at double speed, giving you even more culture, and Coliseums (also double speed) will make people happier in your growing empire. Discover Construction (a valuable technology in any case) as soon as possible, and acquire Drama when you can. The Globe Theater should be built quickly.
“Financial” urges you to research “Banking” as soon as possible, as the Banks are constructed at double speed. As you will probably have many banks – consider building the Wall Street wonder as well. Also, you should concentrate on terrains which produce more commerce, as you have a bonus of +1 for each square that generates 2.