What's the best template for process organisation that you have used as a PMM bridging different company circles?

I definitely think the process when it comes to PMM life is very important. Especially for things like GTMs. One of my team's go-to resources is the Confluence Messaging House Template - I like this one because it really is essential for getting everyone on the same page about a product or feature. This is the kind of thing that takes some leg work upfront but pays massive dividends down the line. It helps keep everyone who works on the product or feature – writers, designers, events and sales teams, and everyone else aligned in terms of messaging. The other two templates/process docs my team definitely relies heavily on are the Confluence Product Launch Template and the Trello Go To Market Strategy Template. You can think of these as pairing really well together - the Confluence one is a great place to do a higher level breakdown of the what/why/who/how of your launch - the Trello template is the place where work happens, you can track progress towards the launch and easily collaborate across your team.