[curt.clifton]

Two of the longest threads on the forums cover some of these issues.

Originally Posted by cku

Just moved from "Things" to OF, so far got the basic but without "multi Tags" in OF

See this locked thread for more discussion. Buried amongst the back-and-forth are several examples for dealing with situations where you might want multiple tags.

(1)how best to set Priority such as Urgent, Important etc to tasks

This thread on priorities also includes a few gems for managing without a priority field.