Always explicitly specify the configuration scope using `--user` or `--repo` flags when setting configuration values with `jj config set`. This prevents ambiguity about where the configuration should be stored and ensures settings are applied at the intended level. Use `--user` for settings that should apply across all repositories for the current user, and `--repo` for settings specific to the current repository. Example: ```shell # Repository-specific configuration jj config set --repo 'revset-aliases."trunk()"' main@upstream jj config set --repo gerrit.default_for main # User-wide configuration jj config set --user gerrit.default_for main jj config set --user git.push origin ``` Without explicit scope specification, it's unclear whether the configuration will be stored in the user's global config or the repository's local config, leading to unexpected behavior and configuration management issues.