Q&A for How to Learn Vietnamese

French is an Indo-European language while Vietnamese is Austro-Asiatic, meaning they are not related at all. There may be some French loanwords from colonial days, but you are better off just skipping the extra step and learning Vietnamese.

Yes there is. Search Rising Storm 2, this will teach you the southern accent.

Yes, and you can also throw Chinese into the mix. Malay and Vietnamese aren’t directly related, but they both descended from Chinese.

Yes, try Duolingo.