The final step to implement a forum in web development is to implement the functionality of your forum. This includes how users can register, login, create topics, reply to posts, and vote on topics. You should ensure the functionality is intuitive, secure, and responsive. PHP, Python, or other server-side languages can be used to implement the functionality of your forum. Additionally, you can use features and plugins provided by your platform. When implementing the functionality, you should consider user management, topic management, and post management. User management involves controlling and managing users of your forum such as their roles, permissions, profiles, and preferences. Topic management involves creating and managing topics of your forum such as their titles, content, status, and moderation. Post management involves creating and managing posts of your forum such as their content, attachments, ratings, and moderation. You should also implement a verification and authentication system that prevents spam bots and unauthorized access. Furthermore, you should implement a rating system that allows users to vote on posts such as upvoting or downvoting. Lastly, you should also implement a moderation system that allows moderators to approve or delete posts.