Training or writing books about the software you wrote. For example Wes McKinney is the creator of the Pandas library (https://pandas.pydata.org/ https://pandas

Training or writing books about the software you wrote. For example Wes McKinney is the creator of the Pandas library (https://pandas.pydata.org/ https://pandas.pydata.org/) and wrote the "Python for Data Analysis" book. While the https://tailwindcss.com/ https://tailwindcss.com/ CSS library is open source, the authors make money by selling access to a component library https://tailwindui.com/ https://tailwindui.com/