Or you can find learning a Slavic (or a Baltic) language easier if you learn Latin first. The bonus being that there are more useful cognates in Latin than in Slavic languages (although while learning Czech, I was a bit amused to discover that many of my childhood friends’¹ surnames were just Czech words for colors). Latin has fewer cases than Czech (five³ versus seven) and fewer declension patterns (there are five declensions with most nouns falling into the first three. In contrast, Czech has twelve and the adjective declensions differ from noun declensions (as opposed to Latin where adjectives follow either a first-second declension pattern or a third declension pattern).

Slovene is a bit simpler in its grammar and lacks some of the tongue-twisting phonemes of Czech (albeit with lj being a challenge for learners).

I don’t really know much of any other Slavic languages beyond the ability to occasionally decipher Polish or Ukrainian billboards via cognates. Bulgarian apparently has abandoned nearly all inflections in its nouns other than the genitive which perhaps makes it one of the easier languages to learn.

For those who want to learn Ancient Greek, in my limited experience, I’ve found Biblical Greek instructional texts easier to work with than Attic Greek (the grammatical differences are not that great with the biggest differences being more in vocabulary than grammar—it seems a smaller shift than between, say Elizabethan English and contemporary English).

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1. I grew up in an essentially vanished American subculture where ethnic diversity meant that there were a handful of Italians amongst the Czechs and Poles. The Czech population of Chicago, which once was the majority population of the West side of Chicago has since dispersed and assimilated to the point where there are only a couple Czech restaurants left in the whole Chicago area where even twenty years ago they were fairly common. The Poles, having a still-active immigration pipeline and larger population to begin with² have not suffered the same fate.

2. While there were a large number of Poles on the West side of Chicago, the larger center of the Polish population was, and still is more Northwest side.

3. Technically, Latin has six, but the vocative case only differs from the nominative in the second declension singular and so is generally omitted from declension tables.