At this point the hardest part of learning a language is unlearning the other languages. Is it "if-else if-else" or "if-elif-else"? Is it "def blah()" or "fn

At this point the hardest part of learning a language is unlearning the other languages. Is it "if-else if-else" or "if-elif-else"? Is it "def blah()" or "fn blah()" or just "blah()"? Is it "len(string)" or "string.len()" or "string.length()" or "string.size()"? Do I need a semicolon? Is it "lambda x: x+1" or "x => x+1" or ...? After that, I find the nano-culture of the place I'm using a language the hardest to figure out. "How dare you use {} instead of end", "Everything must be split into fine grained functions because long functions are death!", all the shit that really doesn't matter that much, but is just the fashion of the group I find myself in. It's like learning regional accents and terms with human languages.