Since the objective of many scams and hacks is to steal your money, you should monitor your bank and credit card accounts on a weekly basis. Also check your bank statements for any suspicious charges. A lot of banks nowadays allow you to sign up for alerts to be sent to your mobile phone or e-mail whenever there’s unusual activity happening on your account. Special internet credit/debit cards for online use only are another great way to limit the risks of shopping online.
Talking of shopping: If you buy something on the internet, make sure it’s from a legitimate site. Before entering your card details, check that the site has an HTTPS address with a little padlock icon next to it. If you’re not sure about a site’s legitimacy, try googling it to see if any others have had issues with it.
I hope that you’ve found some of these tips useful; a lot of times, you’ll just have to use common sense and you’ll be all right. If you’ve nevertheless fallen victim to online fraud, contact your internet provider or the CNPD (Commission Nationale pour la protection des Données).