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


I second this, learn emacs and you will never bother learning any other software (because you’ll be too busy learning emacs for the rest of your life).
Doing this as soon as I’m home from holiday in 2 days