Good practices on branch based collaboration with a review cycle?

[RaimondB]

Are there some good practices on how to set up branch protection rules and/or also do ownership for parts of the repository? I am looking for some mechanism where we can managed the reviews as a task (hence the PR). And I was hoping to do something with a CodeOwners file to assign review responsibility to different people based on the elements / diagrams that are impacted from a branch.