Cholesterol is the one to hold loosely, because the thinking on it has genuinely changed. For years the advice was a firm cap of 300 mg a day, and US national survey data (NHANES) suggests around 39% of people take in more than that older reference. But that specific number has since been set aside.
The reason is that, for most people, the cholesterol in food turns out to have a smaller effect on blood cholesterol than once believed, since your body adjusts how much it makes to compensate. Current guidance no longer sets a fixed limit, instead suggesting you keep dietary cholesterol as low as is reasonable within an otherwise healthy diet.
It's found in eggs, shellfish, organ meats, and dairy, several of which are nutritious in other respects, part of why the blanket limit was dropped. Moderation beats strict restriction. Be a little more attentive if you've been told your blood cholesterol is high, since a subset of people are more responsive to dietary cholesterol than others.