For those who know multiple programming languages, how do you keep the differences straight?

I’ve learned a handful of languages over time (Java, C++, Python, etc.), and honestly, it gets confusing. Like in C++, strings are mutable, but in Java they’re immutable. Or in Java, "2" * 3 + "2" doesn’t behave anything like it would in Python. Every language seems to have its own quirks, and I keep mixing them up when switching between projects and even during interviews. For people who regularly work in more than one language, how do you remember all these small differences? Do you maintain some kind of cheat sheet, rely on muscle memory, or just Google everything as needed?