A note before you act: entry and transport policies can change. Recheck the official source relevant to your nationality and route before departure.
Start with your passport
Entry rules depend on nationality, route and length of stay. Check your passport validity and the official requirements for every border you plan to cross before purchasing non-refundable travel.
Visa-free transit is route-specific
Transit policies usually require a confirmed onward journey to a third country or region. Your arrival city, departure city and permitted travel area all matter.
Keep a simple arrival folder
Carry your accommodation details, return or onward ticket, insurance information and local contact in both digital and offline form.