How are you thinking about or implementing content governance strategies, especially when it comes to highly technical user generated content across multiple websites?

The best content governance approaches I've seen for user generated content (in particular with technical stuff) have been ones where there has been a robust set-up of smart permissions and that then have modular workflows that can adapt what has automated validation and what has not. 

The technical UGC I've seen (specifically now on IT developer documentation or product forums) has been treated with what I would describe as a 'graded trust model':
Tier 1: verified 'expert' content (so they are certified users, SMEs or employees) - very little moderation needed and faster publishing enabled
Tier 2: known community contributors (these are still peer reviewed and flagged for SME validation before publishing
Tier 3: anonymous / non-verified users - stricter reviews and sandboxed environments where it is hidden until approval)

From what I've heard this is also how the likes of Stack Overflow work too.

In terms of the question part "across multiple websites", I'd think this is about would be about ensuring shared metadata and tagging systems from a single source of truth (and thus likely using a headless CMS).

Hope this helps.  

This is one of the pain areas we faced daily... 
1- we developed editorial guidelines to ensure precision in the messages.
2- Employ expert human reviewers especially in technical domains to ensure technical accuracy and prevent misinformation. plus we do a benchmark how other companies in our domain use the too technical content.
3- Use metadata to enable dynamic content serving, based on user expertise, platform objective and regulatory needs.
4- Partner with bilingual experts in your domain.
5- Periodically audit your content.

hope thats help..