Yes it help ! Dofollow links always give boost to your keywords ranking on search engine result page.

It is always good to have links from authority sites.
 

If you have links from high Domain Authority sites, this will
always be a good thing.

You ALWAYS want to have a mix of dofollow and
no follow links so your backlink profile will look natural to
Google.

You should have a MIX of forum, blog comment,
social bookmarking, blog directory, RSS feed directory,
and other social media backlinks.

Good luck and build your backlinks at a steady rate, not
all in one big rush.

yes, forum beneficial to increase the traffic on website