Money (bills, coins, a check, etc.) can represent value or "currency" of some kind (monetary, mental/emotional, effort, energy, or other things of value)—something you tend to give and receive in your life.
Paying money or people demanding money can mean you feel that life—or something in it—feels very demanding right now, or that people are wanting things from you.
Winning money or someone is giving you money can mean you'd like for this to happen in real life, or you're feeling fortunate in your life right now, or someone has actually been generous to you.
Someone owing you money can mean you feel that person "owes you" or is indebted to you somehow—or that you have given more to this person in your relationship than you have received back.