I need to quench my thirst for knowledge and learn something new just for the sake of it.
I’ve already learned:
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Equations and pivot tables in Excel
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Vector graphics in Inkscape
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Music mixing in rekordbox
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Personal VPN on a raspberry pi 4 with OpenVPN
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LAMP stack web hosting
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Streaming & video capture with OBS
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Manual & automatic backups with FreeFileSync
Things I’m open to:
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FOSS (even beta) or free-as-in-beer software
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A high or low learning curve
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Tools for niche fields that I’d otherwise have no reason to learn


There’s always software reverse engineering. As bad as it may sound to some people, the US NSA has a github repositroy for a tool known as Ghidra, under Apache 2.0 license, so you can look at the source code and determine whether or not it’s spyware. If it’s actually NSA quality, you know it should be good enough for reverse engineering old software that won’t land you in trouble if found out by the original devs. Last update was 2 months ago.
I tried a little bit but have yet to go very far at all with it since I am an idiot who thinks he’s smarter than he really is.
Though, taking a page from your book, I am interested in looking up rekordbox now.