Use outcome in formula field in another formula field

[Onur]

Hi,
maybe I its to obvious and I don’t get it - but how can I work with the outcome of a formula field?
Every time I build formulas with which I want to “work further” with the outcome of another formula field there is no output (blank).
Any idea how to make that possible?
Thanks in advance
Onur

[Onur]

Thank you once again - this support from the community is awesome!
This really helped me out.
I will mark this as solution here.