Working with multi language

Ideally, your translators will have CAT tools (computer-aided translation).
If they do, then you can export IDML from the source document, then they can translate and send back an IDML in the target language. Also send them a PDF so they can see the visual context of the words.
If the translators don’t have CAT tools, you may end up copy-pasting their words, which is a good way of making errors.

You will need to adjust the result, as the text will be different lengths to the original, the fonts may not be available in the target language, graphics may not be appropriate for the target audience, etc etc.

And get the translators to look at the final result if you don’t know the target language.

Good luck,
Chris.

Here are some additional resources for working with multiple languages in InDesign:
https://creativepro.com/article/indesign-tips-exploring-world-languages

also see InDesign Magazine issues 11, 12, and 13 here: https://creativepro.com/issues

The PDF linked in the creativepro article in the previous post is a few years out of date (undated in the document, but 2004 according to the PDF file properties).
It doesn’t take into account the availability of plugins to allow the use of the World-Ready and Japanese para composers in “standard” versions of InDesign.