I remember back in school, my first English sentence that I learned is [how do you do]
and now people talk with me like [how you doing] or [how it going]

@Sphinx The styles of collowuial conversation and words change from UK to USA, this is an example.

I also remember learning that unwanted things and assorted detritus would go in the 'trash'.

Which here in Canada is usually called 'garbage', instead. UK people will say it's going 'to the bin' , or to be 'binned'.

Washroom, Bathroom, Toilet, Rest Room, you might find people using variations for the place we urgently need to visit for nature's calls. 😜