You can avoid being caught by online fraud but you need to know what to out look for. This A to Z of fraud created by the Police has many of the classic traps to watch out for. It also has lots of general tips for avoiding telephone and other type of fraud.
Probably this is only site you need to see and refer to on a regular basis
You can also report SCAM phone calls - but it may take some time as they can be busy. Remember to have the time they called and their number if it is available. (Dial 1471 immediately and the time and number will be read out to you.)