I don't understand the downvotes at all. Yes, PHP 8 is different from, let's say PHP 5, but that doesn't mean knowing PHP 5 doesn't help with writing good PHP 8

I don't understand the downvotes at all. Yes, PHP 8 is different from, let's say PHP 5, but that doesn't mean knowing PHP 5 doesn't help with writing good PHP 8. Same with Python 2 vs 3.