Sorry you cannot do weight lifting, but you can do walking, even brisk, avoid fat, sugar, stimulants. and be stress free.

This depends on a number of things, such as your age, whether or not you already have heart disease or other chronic health problems, etc. It’s important to get your doctor’s OK before exercising and start very moderately. Be sure your blood pressure is well controlled before you start a program.

Saturated fat raises cholesterol and is found mostly in foods from animals like beef, pork, eggs, butter and cheese. Plants that contain saturated fat include coconut, cottonseed and palm oil, and cocoa butter.
High cholesterol causes high blood pressure. The best thing for high cholesterol is Losing weight. A plant-based diet in conjunction with a properly conducted fast, most often leads to a total recovery or a vast improvement in hypertension and angina.

There really is no limit to how you can exercise, just don’t push yourself too much. Since you have hypertension, you should stay within the lower boundaries of your target heart rate. Your maximum heart rate is (220-age). Since I don’t know your age, I cannot give you a target heart rate, for a 50 year old person with hypertension, their target heart rate should be 102 – 130 BPM. You can calculate your target heart rate by taking your maximum heart rate and multiplying it by 0.6 to get a good target heart rate for yourself.

With those two rascal problems working against you, I am very surprised your doctor did not give you a specific exercise regimen. I suggest you get the doctors view on improvement approaches.
Walking briskly one hour a day is usually excellent therapy. You can and will walk yourself into better health. You can lower the cholesterol and blood pressure numbers to normal values in many cases.