At the age of 14, your body is going through a lot of changes on your way to adulthood.
Bodies come in different heights, shapes, and sizes so I don’t know what “slim” means to you and whether you are at a healthy weight to begin with, so it’s hard to advise you specifically. My best advice for you would be to eat a variety of healthy foods. Running is fine, but it would be cool if you could do things that make your body move in a variety of directions.
I don’t know what hanging is, but if you’re hanging from something to get taller, it won’t work.
What do you intend to do with the exercise band?
Here is an older thread that discusses the same topic. You might find some interesting information here.
No – don’t worry. You’re at a perfect age to be strength training – nothing will affect your height. When you say “hanging,” do you mean that you’re hanging upside down? If that’s the case, you don’t need to be doing that. You need to get some good advice and instruction on working out. Talk to your gym teacher or ask your parents to get you help with that. Good luck Sidhant & have fun with your workouts!
I would advise you to seek out a fitness instructor. There is very little that you can do about how tall you will be. At least not naturally and the side effects of unnatural methods are not very pleasant.
To enhance your natural potential I would suggest participating in a variety of activities like running, biking, swimming, sports, etc. Eat as healthy a diet as you can. Get plenty of rest. And never exercise sore muscles or injured muscles/joints without the advice of a professional.