I am new to NodeBB.
First of all, let me thank @Staff for creating such a wonderfully themed forum. Comparing to all other Forum scripts out there, NodeBB out performs them in visual display. As I have been keenly comparing nodebb with other new gen forum softwares, I feel nodebb is good for my purpose.

1)I have a few questions though, is there any way users can upload pdfs, as attachments?
2) Can I use images while writing main topic?
3) How can I prevent spams in the foums?