The biggest impact had "Clean Code" by uncle bob aka Robert C. Martin.
If I would nail it down to one thing, it is the comment of Ward Cunningham in the first chapter:
"You know you are working with clean code when each routine you read turns out to be pretty much what you expected. You can call it beautiful code when the code also makes it look like the language was made for the problem."
As simple as it sounds, it was a revelation for me.
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