Your shoulder has crashed,get wrong baggage,etc . You want to sometimes apologize.
In such a case, you should say gomennasai.

We often say Arigatou to convey the filling of gratitude.A restaurant, a hotel,a store , etc . can be used anywhere. Arigatou uses like thanks in English.

Hi,This time , We are going to study about table manners in Japan.
It’s good to put your hands together while saying itadakimasu.

This time , We study greeting in Japanese using movie and pictures.
Japanese is so difficult language.
But don’t mind.