Our team want to create one or two landing pages that are translated and localized e.g. Spanish and Portuguese
This won't be a full site translation, so it doesn't deserve a subdomain or subfolder, just two pages.
Looking at best practices from Google, and wondering are there Craft implementation best practices for:
We are using SEOmatic in case that is useful info.
Another way you could do this - that wouldn't be sustainable to expand later - is to create two landing pages as singles in Craft CMS.
Then, create a new template for wherever you keep your header info (layout.twig usually) with all of the correct hreflang etc. in the header and include that layout template with the associated entry templates.
Give these two templates a route such as domain.com/es/slug (you should be able to do this directly in the singles setup page within the CMS).
This will create the effect you want, but without committing to a full multi-site. I emphasize again that this method does not scale well. But for an interim it should work fine. Remember to make your SEO values for these entries in the correct language. Best of luck!
I would still recommend to create an additional site with a different language setting in Craft (Settings > Sites).
I recommend sharing one section between the 2 sites (pages?). Make sure, the propagation method is set to not automatically propagation entries to all sites. Make sure the fields that need to be translated are enabled for translations and that they are not automatically enabled.
Then create the entries for your additional site/language by either creating new/standalone entries or create translations of existing entries.
