The stadium is usually divided into sections with different price categories (e.g., Category A, B, etc.).
These might correspond to certain stands or rows.
On the KSÍ Ticket Shop, the seating map will show which sections are which category when you buy.
If available, KSÍ will also publish a stadium seating map or guide on their website or ticket page.
Always check the map on the website during purchase to understand where your seat is.