Working capital is current assets - current liabilities. Changes in working capital are used in calculating FCF, although we actually use changes in net working capital (ex. cash and short-term debt/notes payable).
WC = Change in current assets - Change in curent Liabilities
= (change in current assets - cash and equiv) - (current liabilities - notes payable - current
portion of LT debt)
NOA = Net Assets - Net Liabilities
= (Total Assets - cahs and equiv) - (Total liab - Total Debt)
Monetary assets are cash and receivables, and liabilities include all debt and AP