When I started budgeting, everyone threw around terms like discretionary spending and fixed expenses without explaining what they actually meant. Here are the ones that tripped me up most:

Fixed vs Variable Expenses

Fixed expenses stay the same every month: rent, insurance, car payments. Variable expenses change: groceries, gas, entertainment. Simple distinction, but nobody told me some bills can be both. Your electric bill is fixed in that it comes monthly, but variable in amount.

Discretionary Spending

This just means money you choose to spend. Netflix, coffee runs, new shoes. If losing it would be annoying but not catastrophic, it is discretionary. Rent is not discretionary. Your gym membership probably is.

Emergency Fund

Money sitting in savings for actual emergencies. Not vacations. Not holiday gifts. Car repairs, medical bills, job loss. Most experts suggest three to six months of expenses, but even five hundred dollars helps when you are starting out.

Pay Yourself First

Saving money before you spend on anything else. Not after you see what is leftover, because there is never anything leftover. The trick is treating savings like a fixed expense.