1. Start with the passport you will actually use
Dual nationals and travellers with more than one valid travel document can see different rules depending on the passport presented. Start every search with the document you expect to use for the journey.
EntryAtlas passport profiles and Where can I go? are designed for this first discovery step.
2. Check the destination, not just the visa label
Government travel-advice pages typically separate entry requirements from safety, health and local-law information. FCDO foreign travel advice, for example, includes destination entry requirements as part of its country guidance.
Look for passport validity, stay limits, trip purpose, transit rules and any electronic pre-travel permission in addition to the visa category.
3. Re-check close to departure
Entry rules can change after you book. The FCDO travel checklist recommends checking current travel advice as part of trip preparation.
For a non-refundable booking, keep a record of the official page you relied on and check it again before departure.