I like forums because of the knowledge you can gain from people with first hand experience. You can get multiple answers (different approaches) to doing something and achieve the same ending result. You can share your failures and successes and get feedback.
I like this forum over most others because of the people here. Almost everyone here is friendly, the mods are fair, and I can share all my hobbies and at least one person on here will share that interest genuinely. Not just "oh that's nice" type of reply.
Now I am a member of a few other forums that I like equally to this one. One is for arachnids the other is for chickens. Both of which are Very helpful in their own regard. The only downside I have found to the chicken forum is it is hard to share my love of reptiles and Ts with out getting that's weird or gross. But other than that they are extremely friendly.