Dietary management of high cholesterol is a little different than was once thought, but some things remain the same. We used to think that dietary cholesterol had a big impact on your blood cholesterol, so it was recommended to limit your intake of cholesterol. This point of view has more recently gone away with newer research.
However, something that still remains the same in cholesterol management is your intake of certain types of fat. You want to limit saturated and trans fat intake, which are going to be found mostly in high fat animal products (high fat dairy, fatty meats), solid fats like lard, and processed/packaged dessert type foods (cookies, cake, ice cream, pastries, some "junk food" snacks).
On the other hand, you want to include healthy fat sources throughout your day, which are the unsaturated fats. Unsaturated fats are found it nuts and seeds, plant oils, seafood, avocados, flax and chia seeds, hummus, etc.
One other thing about keeping your cholesterol at a healthy level is to maintain a healthy weight. Keep in mind that if your high cholesterol is mostly genetic, you may need medication to help control it even if you are eating a healthy diet, exercising, and maintaining a health weight.