Not a language expert, but I've had some success gaining general fluency in one (non-native) language, and at least a smattering of a half-dozen others.<p>Basic language courses (e.g., Berlitz, Duolingo, Rosetta Stone, etc.) can be useful in giving a basic grounding.<p>Many countries have <i>both</i> native-language (that is, source country, not audience) broadcasts and podcasts <i>and</i> language-specific instruction. I'm more familiar with German-language resources here (especially the Goethe Institute and Deutsche Welle), which are excellent, but have had success in other languages (though not specifically Polish).<p><i>Children's stories</i> are an excellent basic language-learning tool. The grammar, syntax, and vocabulary are basic, but they do cover the fundamentals, and provide a good basis for further skills development.<p>Once you've gained basic fluency, one podcast series I've recently discovered is the Easy Languages family of podcasts ... which includes an Easy Polish channel:<p>Easy Languages: <<a href="https://www.easy-languages.org/" rel="nofollow">https://www.easy-languages.org/</a>><p>Easy Polish: <<a href="https://www.easypolish.org/" rel="nofollow">https://www.easypolish.org/</a>><p>Having your current foreign language playing constantly is an excellent way to simply become <i>attuned</i> to it. Increasingly I find I'm learning to recognise specific words and terms long before I know what they mean specifically, though I can often work that out from context.<p>Easy Languages also has an overview podcast which has 22 episodes mostly focused on the <i>process</i> of learning additional languages, several of which should be of specific interest to you: <<a href="https://www.easy-languages.org/podcast/episodes" rel="nofollow">https://www.easy-languages.org/podcast/episodes</a>><p>More generally: use your podcast app to find and subscribe to podcasts which are either specifically language instruction, or simply target-language, in your language of interest.<p>For Poland specifically, using ListenNotes <<a href="https://www.listennotes.com" rel="nofollow">https://www.listennotes.com</a>>:<p>- There's the Polish national broadcaster Polskie Radio, which has at least six podcasts.<p>- Searching for "children's stories" in Polish, "opowiadania dla dzieci", turns up a couple of results.<p>- "polski angielski" (polish english) gives several <i>thousand</i> results.<p>You might also want to supplement with a text on introductory Polish (for Dutch or English speakers), or a local adult education / community college (or equivalent) course.<p>Others:<p>"The Best Resources for Learning Polish" <<a href="https://www.clozemaster.com/blog/best-resources-for-learning-polish/" rel="nofollow">https://www.clozemaster.com/blog/best-resources-for-learning...</a>><p>"Polish Language Classes: 48 Resources and Lessons to Learn Polish Free Online" <<a href="https://www.fluentin3months.com/learn-polish-free/" rel="nofollow">https://www.fluentin3months.com/learn-polish-free/</a>>