ORayjA0's explanation is on the point and explains everything re: the process itself.

If you just found out about the project i would just advise you to read the Whitepaper first:
https://www.culturalplaces.com/wp-content/uploads/2018/02/CulturalPlaces_Whitepaper.pdf?x46035

Otherwise..the ICO is split into several different phases and each one offers different conditions for buying coins.