So far I learned about Relationships and Protection/Essential. Now it's time to understand Forcegreets

I thought it was simple, but there's more to forcegreeting than I anticipated. Whenever I try putting a forcegreet dialogue on the quest dialogue, then connect the topic to the AI package of forcegreet, it seems forcegreet itself isn't activated or it is, but doesn't go in the lengthy discussion I would think be done (Such as the Black Briar guy at Riften for example) So I'm wondering if I'm missing a few steps.

Also, I want to learn and understand how to shut down a forcegreet right after it's completed. Especially when you load up our game. It seems whenever I make topics, even if I put it as say once on the check box, it seems the topic keeps coming up again. How do I make sure this is only a one way topic and after discussing it, the player can't see it or speak of it again.

Thanks in advance. I'll try and do some research myself. But hopefully, an expert can help me. Be alot easier, seeing how I've been trying to work with this for a while.