I've lost 40ish pounds and counting. My two cents:
-weight loss comes from changes to diet more than it comes from exercise.
-Expect weight loss to take take and be a lifestyle change (rather than a short term diet).
-Get a food tracker app like myfitnesspal. There are a bunch of studies that show that logging your food causes you to eat less.
-Set targets for macronutrients (protein, carbs, fat). The most important of these is protein, just because it is more satiating than carbs + is good for rebuilding your muscles if you are exercising.
-Once you have a baseline for what you are eating, titrate down your calories. You should be shooting for something feasible that doesn't involve too much suffering.
-If possible, only eat stuff you made yourself (or where you understand all the ingredients)
-Make sure you are eating before you are hungry, the hungrier you are, the weaker your willpower and the less compliant you will be with your diet.
-Set planned cheat days. For me Friday is cheat day, there is research that shows that having set cheat days makes it easier to maintain generally good dietary habits over the long run. Also, psychologically, it's nice to have a break from trying to maintain self-control all the time.
-Exercise regularly. I personally recommend finding something that you enjoy where it is easy to set goals pursue, that way you have something to keep you motivated for however long it takes to ultimately lose the weight. I think there's also some evidence that running etc. helps suppress people's appetites.