What food is good when you are trying to lose weight?

You can eat whatever you like for weight loss, as long as it's the right amount of calories and it keeps you sated.

It's usually recommended to eat a lot of whole foods and home-cooked meals: for health and also satiation. Many people find high-protein foods and high fiber foods filling. But if you want to lose weight and also keep it off, it's best to find your own way, rather than just follow what someone else says: preferences are highly personal and the key is finding a way of eating you enjoy.

If you give us an idea of how you're currently eating, we might be able to offer some ideas.

Slow, step by step: sounds like a good plan 🙂
If you make gradual changes to your habits, you're more likely to stick with it long-term and make durable progress.

Something I read, which may be useful: that's its better to focus on what you need to add to your diet (fruit, vegetables,...) rather than to focus on what you should eliminate/eat less of.
Also: even les nutritious food can have a place in a healthy diet, so you don't need to be extreme 🙂