Welcome to WebmasterWorld codyhay
Can anyone share tips & tricks on the topic "How to do SEO for a multilingual website?"
We've been having a discussion about this here:
Is this for an ecommerce or evergreen informational site?
There are no tricks, it has to be done correctly otherwise the site will go nowhere. Trying to make a one size fits all site is extremely difficult and, as such, usually very expensive to create.
I've been constructing non-English sites since the mid 90s and after many trials, experiments, failures and successes, all my "foreign language" sites are created on a specific domain in that language's most popular country and hosted there as well.
For instance, for German it's example.de hosted in Germany for Austria, Northern Switzerland etc, however for Spanish I actually host in the USA with a .com and it seems to work reasonably well. Portuguese has always been a problem no matter what I do! French, Italian and Russian, no problem, for China I have always found it important to host there to get decent enough traffic.
For ALL sites I use real, widget trade people to translate them. Even though I speak and read several languages, nothing beats the local trades' person lingo.
All my sites are evergreen information for my widget industry and, fortunately for me, English has been the trade's dominant language for 200+ years therefore in nearly every widget business in every country there is always someone with a great command of the English language.
If it's for ecommerce I haven't a clue and wish you luck. I know there are multilingual sites out there and I cannot imagine just how much some of them have cost!
One tip, if you go down the stand-alone country sites, it is always good to have a local contact point if at all possible.