Visa rules change frequently and vary by purpose, duration and even point of entry. Treat any list, including this one, as a starting point rather than an authority.
Visa-Free, Visa-on-Arrival and e-Visa Are Not the Same
Visa-free means you present a passport and enter. Visa-on-arrival means you apply at the border and can be refused there. An e-Visa is approved before you travel. The practical risk differs sharply between the three.::Six Months Validity Is the Common Rule::Most countries require at least six months of passport validity beyond your return date, and several require two blank facing pages. Check both before booking, not after.::Proof of Onward Travel Gets Checked::Airlines are fined for carrying passengers who are refused entry, so they check onward tickets even when immigration might not. Carry a confirmed return or onward booking.::Apply Earlier Than You Think::Schengen appointment slots in particular can run four to eight weeks out during peak season. Start the process as soon as dates are fixed.