It really is as simple as ensuring that the calories you eat are less than the calories you burn. HOW you choose to ensure that is up to you.
Personally, I like the MyFitnessPal to track my food and calorie intake - if you tend to cook from fresh then I would recommend getting a cheap food scale as "eyeballing" your portion sizes will usually be well underestimated! I also always find that when I make a serious effort to increase my fluid intake, I am less hungry generally overall so perhaps try that as a starting point?
Other people like to eat low carb or low fat (so reducing their calories by cutting out the calories in carbs or fat), intermittent fasting (where you eat say 500 per day 2 days per week and then "normal" but healthy foods on the other 5 days), one/two meals a day (where they skip breakfast and eat only lunch and/or dinner). Some people find the alternative methods of "calorie counting" used by Slimming World and Weight Watchers to be more helpful (as counting "syns" is basically a method of moderating the amount of high calorie foods you eat).
I'd suggest you sit and think about the biggest issues you have with eating at the moment and how to address those. Are you a big snacker? If so, can you replace snacks with sugar free squash/fizzy drinks instead? Or lower calorie snacks? Or find something else to do entirely when you feel the desire to snack? Do you not really snack, but eat huge portions of food at meals? If so, load your plate up with low calorie veggies so you still get the quantity of food but with fewer calories. Are you active at all? Try adding in a little more activity into your day such as a walk. It won't be enough to help you lose weight on it's own and don't add enough to make you more hungry so you eat more but it will help a bit towards increasing your calorie burn as well as making you feel generally better!
I would strongly advise taking the time to think about a plan that will work for YOU (your lifestyle, food preferences etc) and that you can maintain long term. Things like Herbalife can make you lose a lot of weight if you are strict about it, but it won't be sustainable long term unless you also change your eating habits once you stop on Herbalife/Slimming World/ etc.