Hurdlr has a lot of good tips for blossoming web developers here: https://hurdlr.com/blog/software-web-developer-tax-deductions
In addition, there are a lot of ideas for entrepreneurialism (new word!), making money on the gig-economy, and how to scratch back money from your car/smartphone, spare hours, etc. I.e. “the Uber of [x]” jobs.
I found it useful!