> A genetic relationship between Finno-Ugric and either the Japonic or Turkic language families, if it exists, is so weak that most scholars believe there is no evidence for it.

But from practical point of view, these languages share common features like: vowel harmony, phonetic writing, suffixal affixation, grammatical cases. These skills transfer easily over to the next language, once you learn them with one language.

(Not all languages mentioned share all the features.)