The phrases that get you fed, housed and pointed the right way.
You do not need grammar to travel — you need the right phrases and the nerve to say them. This path is situational: each module covers one place a visitor ends up, with the exact words that work there.
Bargaining, autos, trains, food and being unwell — these are the phrases written by people who use them, not copied from a phrasebook. Practise each set before you need it.