To "avoid falling into a trap" means any situation that you might get into unknowingly and have a hard time getting out of. It can be financial, but also social or some situation in a marriage. Another related term is "pitfall" - an unsuspected difficulty, danger, or error that one may fall into.

its a term used to descibe a situation where there are risk involved such financial or a situation where you are likely to purchase somthing that you may find it difficult to get out of should you discover that it wasnt what you thought you were buying and decide to change your mind