Ah thanks koko I think I have it a bit easier than a lot of people, no kids and a lot of time!
I tend to be ok in the week, I don't eat breakfast, never really have. On fast days I have broth or miso for lunch and then an early dinner at about 5 that is usually veggie sausages, quorn chicken or tofu and a load of veg. I don't specifically count calories but I know what I am eating won't be more than 600 or so cals
On a non fast day I have veggie soup, boiled eggs/quorn chicken/tuna salad or ff greek yogurt and berries for lunch (approx 200 calories).
And then dinner can be anything really 500 calories for one meal is a pretty decent amount, especially when I am not having white carbs.
I don't weigh/measure non starchy veg, I weigh fats, protein and dairy and I have to portion up things like hummus or nuts or I eat the whole tub.
I am trying to not snack at the weekends, eating whatever I like but only as part of a meal if that makes sense. That is what I did this weekend, and I only gained the one linda, I am assuming that is mainly cheese based!