I am a beginner in Italian and in the start, I was taught that adjectives must agree with the noun it is talking about with (-a, -o, or -i) endings. I am having a lot of trouble forming sentences because I keep conjugating words next to nouns and I am not sure if it is incorrect.
Lui ha una personalità responsabila (so here responsible is a characteristic of a personality and I guess personality if feminine so I would conjugate responsabile)
E un posto tradizionalo (so here posto is masculine so I changed tradizionale to masculine form, but why is this wrong)
E un posto antico (here I did the same thing, ancient is conjugated to agree with the noun, but why in the above example the sentence would be wrong, but in this last example it is right?)
I don't know what I am missing, please help.
Adjectives : Responsabile and Tradizionale have only singular and plural form.