To summarize, why join Lua Forum?
People new to programming are most likely not going to join a mailing list
The forum has great SEO and it’s the first place many beginners look for help
Technical documentation can be scary and there's no way to ask a question
Experts can share good coding practice and style
Posts will never be deleted
I hope you join, but no pressure if you don't. It's up to you.
Out of curiosity I tried joining your forum. First of all, I note that it is a closed forum: new accounts require moderator approval. I do not approve of that at all; I have no interest in participating in closed forums and am likely to cancel my account as a result. Secondly, I joined last week and I have been waiting for five days now for my account to be approved, which is hardly an encouraging start.
If you are trying to create a welcoming place for beginners then I would suggest that you are falling well short of the mark. Just my opinion, take it for what it’s worth.