It depends how strict you want to be really but there's two approaches;
a) you are a bit overweight and would like to lose a bit in no great rush, in which case you can give up sugary things, processed foods, things with wheat in (bread pasta) and rice, potatoes etc.
you will still get carbs from fruit and veg and other things that you eat but you will feel better and lose weight.
or
b) you have a lot to lose and want to do see results more quickly..
In which case you can avoid eating almost any carbs and live entirely on meat, green veg, salad, eggs, cheese, nuts, berries, until you have lost the weight then gradually reintroduce some carbs to have a wider variety of foods(but not bread, never bread!) ,
you will GET very few carbs and after a few days your body will go into ketosis and instead- and you will lose weight.Its feels a bit restrictive at first because there's so much you can't have but you very quickly find out that there's loads you can have instead and there's a thread on here with loads of menu ideas.
The good thing about both of these approaches is that you are not "dieting" as such because you are not restricting the amount you eat and should not go hungry at all. Also you can't have processed food so you are entirely in control of what you eat and how many calories are in it and it is much healthier. Processed food is what is causing the obesity problem at the moment.
If you do b) you will find you rarely get hungry because your body doesn't need to tell you to eat.
It's the best regime I have done and the only one where I didn't just stop losing weight after 3 weeks and fall off the wagon. The feeling of being in ketosis is great - quite euphoric at times...and you don't have to cook separate food for yourself - DP has what I have but with carbs.
Beware though, if you do b) and cheat you will drop out of ketosis and have to spend days getting back into it, during which your body will try to get you to eat carbs and you will feel hungry and tempted...
good luck and if you do decide to have a go please look at the menu thread - you will see that low carbers tend to eat very well!