If it's heart health, cut down on the saturated fat. It increases cholesterol (LDL) leading to damage to the arteries and in the long term, atherosclerosis. On the other hand, products with pholyphenols like green tea increase the good kind of cholesterol, HDL, which helps against artery damage and is thus good for the heart.
There's a downside though, are you male? Because the same polyphenols also increase estrogen. Estrogen is good for the heart, but not perfect for your health if you're male (not the say you don't need estrogen at all, but most men already suffer from low test, let's not make it worse)
Estrogen being good for the heart is the same reason why like 76% of random heart attacks happen to men.
And since we're already talking about cholesterol: Cholesterol might be bad for the heart, but it's damn good for testosterone. In fact, the testicles take cholesterol and use it to produce test (also to produce estrogen in the ovaries if female)
Studies have shown that men with lower cholesterol levels, have both a healthier heart but also lower testosterone.
Also, mono-unsaturated fatty-acids are generally good for heart health with no particular downsides (that I know of). I.e. olive oil and peanutbutter
The fatty acids eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) might be good for the heart, science isn't 100% sure. But adding fatty fish to your diet, say once a week, is always good. Just don't eat larger fishes or non-fatty ones like Tuna because they're filled with mercury. Mackerel, Sardines or (wild, not farmed) salmon
Another tip is spicy food/pepper. They're natural vascodilators, which mean they cause the blood vessels to become wider, which allows more blood to flow through.
And 1 glas of red wine per week is also associated with a healthier heart (assuming it stays at that) because of similair reasons to the green tea.
Also lower your salt intake - high natrium levels in the blood, hypernatremia, leads to hypertension. Most people already get all the salt they need (it is neccesary) before all the added salt
In a similair vein, potassium lowers natrium levels in the blood through a process called the natrium-potassium pump. Potassium can be found in for example bananas
en.wikipedia.org
However, like is said above, the best diet for overal health is counting calories with a diverse diet while skipping processed crap. Some apps not only tell you how much calories you consume, but also how much micronutrients and specific macronutrients (for example how much saturated fat instead of just fat in general)
Also cardio and keep your weight normal
