I’ve recently read The 4-Hour Workweek by Timothy Ferriss. I recommend the book to you.
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Timothy goes through some examples of how to generate streams of income that enable us to become financially free. He shows how these streams of income can be created before leaving the regular job. He even shows how the regular job can be made much more palatable by reducing the number of hours required to be wildly productive.
You can find more information about this book on the companion website www.fourhourworkweek.com.