Answer your four questions.
1. Reducing fat is a systemic work. Basically, local fat reduction can only be liposuction. The legendary idea of losing weight wherever you want exists only in advertisements. The only thing you can do is aerobic+waist and abdomen light strength exercise (for shaping).
2. Aerobic exercise, such as running, consumes glycogen in the body in the first 30 minutes and starts to consume fat after 30 minutes. If you only run for 30 minutes, you will get an improvement in physical fitness and have little effect on fat consumption.
Aerobic exercise should be at least one hour at a time according to your height and weight. You are a little overweight. The strength must be increased. Take the treadmill as an example. If you can't run for an hour at a time, increase the slope of the treadmill and combine walking and running. Aerobic mainly depends on heart rate and time, and running distance is secondary.
4. The gym is aerobic, including treadmill, elliptical machine, mountain climber, spinning bike, skipping rope and swimming.