DRY (don’t repeat yourself) is the only programming rule everyone follows blindly wether beginner or senior.
Avoiding some code duplication brings coupling but coupling is a way more dangerous beast.
I say fuck DRY !
I say repeat yourself !
The default rule must be duplicate. And then, after a while, if the same things change at the same time and for the same reasons (as Robert C. Martin says) then you start to mutualize some code.