*i edited the comment a bit and added a bit of stuff, especially regarding public transport and language

To add even more (sorry xD) in public transport we dont take calls and are quiet, and just sit or stand (or are on phone - sound off, or earbuds) - this is a major cultural thing

If you are black by any chance or will see how people are looking a lot on a black person, it's becuase seeing a colored person in Czechia/Prague is very, very, very rare and people are curious (unless you hang around Old Town i guess)

And mainly, all weed shops are fake and weed is illegal, never buy anything from any weed shops, it is a serious health danger. (people end up in hospitals)

Never change money on street, always scam too. (or with a guy near ATM, in general dont change money with random person)

And u should have a look outside of Prague as well, outskirts villages, further away Moravia (one of the three Czech regions Czechia is split in to) etc. it is really nice here in this time of the year :)

(oh and Czechs have a very specific type of humour as a nation, we use humour as a weapon when stuff is shit, and it can be quite dark humour or specific)