Also, what would i need to learn before getting into that?
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read https://develop.kde.org/docs/plasma/theme/quickstart/
You can use existing themes for reference, just download the source and look at it. https://github.com/topics/kde-plasma-theme
Yep, start from there, I would also like to point out that in the newly released Plasma 6.6 you can save your current settings as a global theme, so you also have that starting point.
Look at other themes, how they were done.