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What do you find difficult about learning Polish? [98]
ALL Slavic languages have certain basic silmilarities, the numbers, for instance and various formulaic greetings etc. Structurally, Polish, Russian, Czech and Croatian have the same roots, but vocabulary can be especially tricky, loaded with false friend "booby traps", some of which can be harmless, e.g. Russian 'pismo' (letter) vs. Polish 'pismo' (general body of written work) etc..., while others not-:) LOL
Counting for a monolingual Pole travelling to Zagreb would prove little difficulty, that is, slowly identifying individual words in a written text. Beyond that however, it'd be as if a Parisian who only knew French going to Italy without speaking the language: It wouldn't really work, although the latter also speak a closely related language!
Back to Finnish, as it's closest relative appears to be Estonian, another even less commonly studied language (for a variety of reasons!), it's practically impossible to find cognate words in sister tongues as it would normally be among a decent size language family such as the Romance or Slavic group.
With Finnish, as with Hungarian or Turkish, aside from loan words, one's almost adrift without an anchor or sightings of familiar land (-: