I've actually volunteered to give the index fund talk. There are quite a few UK-specific points that don't apply in other jurisdictions, so I would be hesitant to offer generic instructions for an international audience. For example, I understand how ISAs (a tax-efficient investment process) work in the UK, but I don't know what the equivalent would be in other countries, or even if they exist.

This also holds for various other subjects with legal / geographic implications. I understand signing up for cryonics is a very different process if you're outside of the US.