Helpp

Answer:  In the United States we use "condition" as in:  "There was an improvement in his condition" or "His condition improved". 

2) Do you say "from + name of a brand"? "I have a shirt from Ralph Lauren." "My perfume is from Hugo Boss" "My phone is from Apple." If not, what could I say instead?

Answer: I would probably just say:  "I have an Apple iphone" or "I own a Ralph Lauren shirt".  But the sentences you wrote work too.

3) Can i say "Brazil is a agricultral country" or "Brazil has a agriculturally-based economy"? Does either work?

Answer: I would use your second example because it is more clear. Both sentences make sense,  but I just feel that the second sentence sounds more professional.  Just remember to use "an" before the word "agriculturally" because that word (agriculturally) begins with a vowel. (The vowels are: a, e, i, o, u.  So you will need to say "an agriculturally-based"). 

4) One last rhing: On twitter, someone posted this 

ok thinkin bout maybe doin lookbooks on my channel cuz i'm no help on the makeup front cause i do my makeup the same everyday

What does "makeup front" mean? Could you guve me other examples of front used that way?

Answer:  Wow! That sentence is full of slang!  When used this way, "front" just means something like "talking about makeup" or "concerning makeup".  You could say:  "On the boyfriend front, I still am not dating any cute boys".  Or you could say:  "I can't really help you on the money front because I don't have any money right now!"   

Thank you very much