Yes, it is largely true that Dutch speakers from different regions can understand each other, but with important caveats. Standard Dutch (Algemeen Nederlands) is taught in schools and used in media, so most people can switch to it when needed. However, strong regional dialects, especially in Flanders (Belgium) and rural areas like Limburg or Groningen, can be nearly unintelligible to outsiders, even native speakers from other parts of the Netherlands.
The key factor is exposure. Dutch speakers who travel, watch national TV, or interact with people from other regions learn to understand a wide range of accents and vocabulary. For example, someone from Amsterdam might struggle with a thick West Flemish dialect, but they can usually grasp the gist. Conversely, speakers of strong dialects often code-switch to a more standard form when talking to someone from a different area. The biggest challenges come from vocabulary differences (like 'patat' vs. 'friet' for fries) and pronunciation quirks (the soft 'g' in the south vs. hard 'g' in the north).
For learners, this means you don't need to master every dialect. Focus on standard Dutch first, as it will be understood everywhere. However, be aware that when you travel to specific regions, you might encounter words or accents you don't recognize. Listening to a mix of Dutch media (like NOS news for standard Dutch, and regional shows or podcasts for variety) helps build adaptability. The tradeoff is that dialects add richness but also complexity; you can choose to learn a local variant later if you live in a specific area.
To evaluate your own understanding, try watching videos from different Dutch-speaking regions (e.g., a Flemish news broadcast vs. a Rotterdam vlog). If you can follow the gist, you're doing well. If not, don't worry, even natives sometimes need subtitles for heavy dialects. The practical next step is to expose yourself to diverse Dutch audio regularly, and when in doubt, ask politely for clarification. Most Dutch speakers are happy to slow down or explain.