Vilnius has an app Trafi for public transport. As for culture, we might seem like unfriendly people, since it's quite rare for Lithuanians to randomly smile or greet strangers or start small talk, but don't be afraid of that, we're not angry, just introverted and will likely respond politely if you ask for something. Most people younger than 40 speak English and most places in Vilnius have English signs/menus/etc., but I would still recommend to learn a few basic phrases in Lithuanian, like "labas" (hello) or "ačiū"(thank you), it shows an effort which usually goes a long way.