Learning a language for a trip is different from learning it on a large scale; Duolingo is way too comprehensive, as is anything that tries to build up from fundamentals of grammar. You need a few phrases, like “please” and “thank you,” “What does this mean?” and “Where is the…
Dang, it feels so good to be righteous about literally everything. So sure of your moral compass and belief system. No wonder people refuse to see their own hypocrisy. It ruins the high.