If you're looking to find the cheapest insurance available to you then the internet is the best place to start. With thousands of websites dedicated to finding you cheao insurance, you'll be sure that you'll find the right one for you sooner rather than later.
With everything on the internet, the trick to finding what you're looking for is to have a good basic idea of roughly what you want. In the case of insurance that would be the type of insurance (car, home, unemployment, payment protection, health, life etc.), the parameters you are looking for in each (how much coverage you'd like, what sort of terms, if it's for car insurance are you looking for multi car insurance or restricted mileage cover etc.) and finally it's always good to have an idea in mind as to how much you'd like to spend per month.
Before you start looking, figure out how much you can afford to spend first. It's worth weighing up any additional costs that may come as a result of not having the right insurance, or not having any at all in extreme cases, because this will give you a much better understanding of how important your insurance policy will be to you.
Once you've figured out an answer to all the above, it's time to start your search. The best search practices online are to use specific keywords relevant to your search - don't be vague because it'll be like finding a needle in a haystack that way!
If you're looking for car insurance, for example, try searching for "cheap car insurance -your area- -type of cover needed-" in a single search. This will certainly narrow things down for you and make it much easier to pinpoint the companies that are of interest to you.
One very important thing that people forget to do is to bookmark any sites that sound good for future reference. We often hear about people who found the perfect insurance company through an internet search, but forgot to save the address or write down the phone number and then had to spend hours looking for them again. Your time is important, so don't waste it on such frivolous pursuits when they can be easily avoided!
Best of luck with your search!