Navigate to free charging stations

Hi, my XC90 T8 will be delivered in 14 days. Is my first experience with “E” – so I’m totally Newbie. How do you do that with navigation to free charging stations? I am primarily traveling in Hamburg, first registered with EnBW (Mobility plus App) and see if I will use anything else. In the area of my employer there are a few columns, which are also often occupied (there in the middle of the city), but one is usually already free, question is only: which? How do you do that most skillfully? I drive about 30-40min to work, so don’t know where a column is free when I’m on site. In addition, I also cost another question to the: if I pay about 60ct per KW/h and about 20 kw/h load (from 0-100% plus loading losses (how high are they so? 1kw/h?) then I’ll cost about 12€ – but that’s only about 50 km long. So I’ll be happy to pay for my own 100km.