Only spend an amount that you can afford. Always set a budget and stick to it.

You can make use of the Spend-Limit feature in your account section to set a budget.

Only bid for a product that you actually need.

Avoid chasing losses.

Keep track of the amount of money you are spending. You can find the details of your spending in your account section.

Before you start bidding, decide the number of bids you are willing to place and/or the maximum price that you can pay for a product.

If you need to have a break from bidding, take a break.