Is coronary artery disease the same as arteriosclerosis and myocardial infarction? please advise!

Coronary artery: disease and arteriosclerosis are essentially to names for the same. You can have these without infarction. A myocardial infarction occurs when blood flow is abruptly interrupted in a certain coronary artery and heart muscle is not receiving adequate blood supply.

CAD: is the same as arteriosclerosis, though arteriosclerosis can refer to sclerosing (scarring) of any artery, not just those in the heart. A myocardial infarction (commonly called a heart attack) occurs when there is complete cutoff of blood supply to some part of the heart muscles, usually due to underlying coronary artery disease.