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There is an enormous amount of visa information on the internet and almost all of it is unreliable, not because people are dishonest but because it goes stale silently. Entry rules change with little notice, they differ by nationality in ways that summaries flatten, and a page that was accurate when written stays online looking exactly as authoritative once it is wrong. Here is the method that does not rot.
The four things that determine the answer
Almost every bad piece of visa advice fails because it ignores one of these. Your answer depends on all four together:
Your passport’s nationality — not where you live, not where you are flying from. The passport.
The destination, and sometimes the specific region of it.
Your purpose — tourism, business, study, work, volunteering, or transiting. A rule that allows visa-free tourism often says nothing about the others, and "just helping out at a hostel for a bed" is work in the eyes of most immigration systems.
Your length of stay, and how it is counted. This is where people get caught.
Many allowances are not “90 days per visit” but “90 days in any rolling 180-day period.” Leaving for a weekend and coming back does not reset it. This single misunderstanding produces more overstays than any other.
The only sources worth trusting
In descending order of reliability:
1. The destination country’s own immigration or foreign ministry website. This is the authority. It is often ugly, sometimes badly translated, and it is correct.
2. Your own government’s travel advice page for that country. Written specifically for holders of your passport, updated actively, and it covers entry requirements alongside the safety information. For most travelers this is the practical first stop.
3. The destination’s embassy or consulate in your country. Slower, but they answer specific questions the websites do not.
Everything else — including aggregator maps, forum threads, and any article that shows you a color-coded world map — is a starting point for curiosity and not a basis for booking.
The visa-on-arrival trap
"Visa on arrival" sounds like the problem solved. Read the fine print, because it usually carries conditions:
It may only be available at certain entry points — specific international airports, but not land borders or smaller airports. Arriving overland at a crossing that does not issue it is a genuinely serious situation.
It frequently requires a printed onward ticket, proof of accommodation, and sometimes proof of funds. Airlines check these at departure because they carry the liability.
It often requires cash, in a specific currency, in clean notes. An ATM at the border is not a plan.
And increasingly it has been replaced by a mandatory online pre-authorisation that must be completed days in advance — several major destinations have moved this way, and the change is not always loudly announced.
Transit is a separate question, and it catches people
Changing planes in a country can require a transit visa even if you never leave the airport, depending on your nationality, the airport, and whether you must pass through immigration to collect and re-check bags. If your itinerary has you leaving the sterile area for any reason, you are entering the country as far as the rules are concerned.
Check the transit rule separately from the destination rule, every time you build an itinerary with a connection in an unfamiliar country.
The scam layer
Search for almost any country’s visa and the top results will include commercial sites that look official, charge a substantial "service fee" on top of the real government fee, and provide nothing you could not do yourself in ten minutes.
The tell is the domain. Official government sites have country-specific government domains. If the page is asking for card details on a domain that could belong to anyone, stop. Go to your own government’s travel advice page, which will link to the genuine application portal.
The five-minute routine
Do this the moment a destination becomes real, and again a fortnight before you fly, because things change:
Open your own government’s travel advice page for that country. Read the entry requirements section in full. Note the maximum stay and how it is counted. Check whether any pre-authorisation is required and how long it takes. If you have a connection, check the transit rule for that country too. Then apply only through the link on the official page.
Print or screenshot the approval. Airline check-in staff want to see something, and airport wifi has a way of failing at exactly that moment.
The bottom line
There is no list you can bookmark, because the answer depends on your passport, your purpose, your length of stay and today’s rules — and the last of those changes without warning. What you can bookmark is the habit: official sources only, check the counting method, check transit separately, and never pay a middleman for a form you can complete yourself.
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