I have a salad with dinner almost every day. Having a bowl or even two before the “main event” tends to fill me up in a way that I don’t overeat what may follow, which isn’t always steamed white fish or chicken breast 
I don’t try to limit the types of food I eat, bc that is unsustainable for me in the long run. Like most folks on this site, I prefer a good variety of foods, so I don’t do ‘no or low carb’ or any other diet craze/nonsense.
I generally have a bowl of Greek yogurt with berries for breakfast, maybe eggs for lunch. If the rare lunch is bigger or more extravagant than usual, dinner will be a smaller meal. I don’t measure or count calories bc it bores me to death, and I have more important things to focus on… I just wanna eat, and GO (flashback!).
Obviously, any amounts of sugar (pastries, baked goods, chocolate, ice cream, etc.) are a rare treat, and generally not part of my daily food intake.
And lastly, portion size is everything. Cut in half what you want, then cut that in half again. It’s a start.
