Choose your passport and where you are going: see whether you need a visa, how long you can stay, the official website to apply and the passport validity rule. Below is the list of documents consulates and airlines usually ask for.
We are not a government website. The rules come from Travel Buddy, a visa requirements database updated daily; confirm them on the official website or with the embassy before you travel.
Every consulate publishes its own list, and it is the one that counts. These documents are on most of them.
The country that issued your passport, not the one where you live. With two passports, check both: the rules can differ.
Check every country of the trip. A few countries ask for a transit visa even for a connection at their airport.
Open the official link in the result to confirm the rule, then gather the documents from the list above.
The documents every Schengen consulate asks for, from the EU Visa Code and the EU lists of supporting documents.
“Reservation of or return or round ticket”
Visa Code, Annex II: documents that show you intend to leave the Schengen Area
Confirm the rules with the government of your destination. These pages answer for the most asked destinations.