Sharing the slices of a pie and scarcity mindset


Could you please suggest some resources I can have a look at (or some books) about the fact that we don’t share the slices of a pie when it comes to money? I heard Brooke’s teachings about it…and the fact that we need to think that there is a slice of money that nobody else will access, if we don’t access it…but I really struggle to understand how it applies practically.
And I am pretty sure it doesn’t always happen that if one gets more money, others don’t get less. Depending on how that one makes the money, it can happen that others get less…
…I would like to become good at both: having more money without other people having less because of it, and not spending my money so that I am making somebody else richer and me poorer.
Thank you in advance.