How can you use comments to build cross-community relationships and reputation?

Reddit's reputation system is decentralized — there is no centralized follower count or endorsement system that accumulates across communities. Reputation is built through the accumulated memory of your contributions within specific communities and, for prolific or distinctive contributors, a recognizable writing voice that users carry from community to community. Consistent presence in specific communities is the foundation of cross-community recognition. Regular, high-quality contributions in a subreddit over time create a track record that community members notice and associate with your username. Moderators of well-run communities pay attention to who their reliable contributors are, and this can lead to invitations to become a recognized contributor, trusted commenter, or even a moderator. Trying to build reputation by posting infrequently across many unrelated communities tends not to accumulate the same depth of recognition. Cross-community relationships develop when you encounter the same users in different subreddits. Reddit allows users to follow each other, and people who find your contributions valuable in one community may follow you and engage with your comments elsewhere. Commenting with a consistent, recognizable voice — a distinctive perspective or expertise — makes this more likely. Being known as a reliable source on a particular topic creates organic audience-building within Reddit's interest graph. Linking ideas across communities thoughtfully builds both reputation and genuine value. When you can honestly say "I saw a discussion in a related community that's relevant to this question," and provide a helpful pointer, you serve as a connector between communities — a role that benefits both communities and that experienced users recognize as a sign of breadth and good faith. This must be done without self-promotion; linking to your own posts in other communities as a form of advertising generates hostility. The goal is to enrich the specific conversation you are in, and reputation follows as a byproduct of doing that consistently over time.