The best forums to use are those related to your niche. Look for active communities where your target audience hangs out. Avoid spammy forums, as they won’t help with SEO or traffic. Also, make sure to follow the forum rules to avoid getting banned. If you need a guide on how to find and use the best forums, I recommend reading
https://linkbuilder.com/blog/what-is-forum-posting – it provides great insights on forum selection and posting strategies.