Is it true that if you die in the month of Ramadan you go straight to Heaven?

There is no such thing. The only condition for going to heaven is testifying (saying by tongue and heart) that "laa ilaaha illallahu Muhammadan 'abduhu WA Rasooluhu" or at least "Laa ilaaha illallah" which means that "There is no god but Allah and Muhammad (peace and blessing be upon him) is his servant and messenger" for a person before death.

It doesn't metter where or when one dies, this is the only condition for going to Jannah (heaven). Otherwise there are unbelievers who died in month of Ramadan, are they in the heaven then?

This is what I know. W-Allahu A'lam (God knows the truth).

Subhaanaka laa 'ilma lanaa illaa maa 'allamtanaa. Innaka antal-'aleem-ul-Hakeem.

Sincerely

answ2. The unbelievers would have it that when you die you are dead.

The important thing is to leave the Universe in a slightly better condition than that in which you found it.

Those with less lofty aims may substitute 'Earth' in that sentence.