This video from MedlinePlus covers the topic of LDL and HDL.
Cholesterol is a substance that has both positive and negative effects on the body. It is necessary for cell membranes and producing hormones, vitamin D, and bile. However, when cholesterol in the blood sticks to artery walls, it can form plaque and potentially obstruct blood flow, leading to atherosclerosis. This can cause heart attacks, strokes, or peripheral artery disease. There are two types of cholesterol – LDL (low-density lipoprotein) and HDL (high-density lipoprotein). LDL is often called “bad cholesterol” as it contributes to plaque formation, while HDL is considered “good cholesterol” as it helps remove cholesterol from the blood. Monitoring cholesterol levels through blood tests, aiming for low LDL and high HDL is important. Lifestyle modifications such as a healthy diet, regular exercise, weight maintenance, and smoking cessation can help manage cholesterol levels, while medications may be prescribed based on cardiovascular risk factors. Periodic cholesterol checks are necessary because high cholesterol often has no symptoms.

https://medlineplus.gov/medlineplus-videos/cholesterol-good-and-bad/