Roughly, "Luogo" might be seen as the high-level correspondent of "Posto". Both define a region of space, but Posto can even be a "seat" as above said, as technically, Posto is the Past participle of the verb Porre (to Set): so that it indicates "[PLACED, OCCUPIED] // A region of space meant to be occupied". In geography, in scientific literature and bureacracy files, place as "region of space" is "Luogo". Also used in a #figurate way: [= FIGURATIVE] "In primo luogo" = first of all [+ "NON LUOGO A PROCEDERE" = no crime to be prosecuted] "Luogo comune" = stereotype; and some other: >> http://www.treccani.it/vocabolario/luogo_%28Sinonimi-e-Contrari%29/ "Posto" has a more colloquial usage. The place to go to tonight, will be "posto" Consequently, much more idioms use "posto" -- Ma va' a quel posto (Go to "that" place) -- Mettere a posto = To give so. a (harsh) lesson >> http://www.treccani.it/vocabolario/posto2_%28Sinonimi-e-Contrari%29/ However, the verbal aspect of Posto (pp) has a formal usage in the expression: "posto che..." when listing the assumptions of a following speech (> [+ GIVEN THAT ...//] assuming that...") I hope it helps EDIT -- see additions in capital letters

Generalmente parlando, sì, poi ognuna delle due parole ha dei contesti in cui l'altra non può essere usata. Per esempio, posto significa anche "seat", "posto a sedere". Al cinema, "questo è il mio posto".

Sometimes you can use both. Example "Siamo stati nello stesso luogo", "Siamo stati nello stesso posto"."Luogo" sounds a little bit archaic, i would use not so often. The main difference is that "luogo" is more geographic, a place on earth, while "posto" has more meanings "un posto al cinema" "siamo stati a Londra , un posto bellissimo" "Al posto tuo non lo farei" etc...

No