Hi! You probably saw this commit and the rumors that Terraform is currently not routinely reviewing and merging community-submitted pull requests on Reddit (link). You may have even looked into tf2pulumi tool because you thought that the Terraform is closing down. Absolutely not!
Yesterday, the Terraform team published a blog post to provide additional clarity and context for the community and commercial customers.
Bhargav Bachina published an article where he describes multiple ways of managing infrastructure in multiple environments. It is a good starting point to learn the options but I don’t think it provides a comprehensive set of pros and cons on each.
Daniel Ciaglia published a series of 3 blog posts (Part 1, part 2, part 3) where he explains how TIER does infrastructure. It covers infrastructure as code, security, states, and teams. Rather interesting content to learn about some of the patterns they use to share data between Terraform stacks.