I use my CC for just about everything and pay the balance off every month...on-line shopping, in-person shopping, restaurants, bills, etc...you name it. Fortunately, I've only had one incident and my CC company caught it even before I did and gave me a call. It is important to be vigilant and check your statements on a routine basis for fraud or other errors. Of course, a lot of other things you can do to protect yourself...shopping at reputable places of business (including e-commerce), etc. Also, check with your CC provider to see what type of fraud protection your particular card offers. Also, get a copy of your credit report from time to time so that you can see if anyone has set up a new account in your name. This happens a lot with those free CC offers...a lot of people just throw them out...shred 'em!
You also have to be very carefull of skimming...this is one of the most common forms of credit card theft because frankly, just about anyone with half a brain and an opposable thumb can do it...actually, you could probably do without the thumb and may only need 1/4 of a brain.
skimming can range from the very simple to more complicated and technically advanced. Really, all one needs is a phone with a camera...take the CC back behind the counter or whatever and take the photo...bam...they have your CC number. Actually, some people are stupid enough to actually post pictures on line and on twitter, etc of the CC...recently a site was discovered called Needadebitcard that collects these stupid tweets and whatnot.
There are also skimming machines that can be fabricated using about $100 worth of everyday ordinary stuff. These are much more dynamic than a simple snap shot in that the card is actually swiped through and all of the information is pulled...these numbers are then usually sold to other criminals and can fetch anywhere from $20-$40 who in turn make an entire fake CC and sell those. These are most commonly used by waiters/waitresses/bartenders, etc...anyone who gets to take your card out of your site when you pay. They can also be put on gas station pumps and the like and be retrieved at a later time.
Then you have the latest and greatest RFID CCs...personally, I don't know that they are worth the "convenience"...ok, I don't have to swipe I just have to hold it up to a scanner...ok, that saved me all of 1/10 of one second, big deal. Meanwhile, you're wide open to other devices that can be easily fabricated to steal the information from that card without it even leaving your wallet or purse. An RFID card emits a signal from a chip and is open for business full time. Protective sheaths and wallets can be purchased to protect against this...but again, is it really all that convenient? I'd rather just have an old swipe card myself.
If online purchase is resulting in your CC number being stolen, it's most likely a hacker who has hacked into either your system, the processor's sytem, or the bank's system itself. Even if you never use your CC to purchase anything on-line, you could still be at risk as many companies keep this type of information backed up to on-line servers. There are also
Just be vigilant...I personally don't go around living my life in fear, but I do remain vigilant and always have my eyes and ears open.