Hi,
There are both advantages as well as disadvantages in doing margin trading. It is more like a double edged sword, if not used properly can cut both ways.
Simply speaking, If you have Rs. 10K and your broker is providing 10 times margin for intraday trading, then you can buy or sell shares worth 1 lac.
Now, if you loss by 1%, then you will lose 1% of 1lac, that is, Rs. 1000. However, your actual loss is 10% + brokerage + other charges.
Similarly, if you gain by 1%, then your actual gain will be 10% - brokerage - other charges.
If you have not used margin and traded with the amount you have, then your loss or profit would have reduced by 10 times, that is, around Rs. 100.
If margin is used properly along with the Money management, then it can be useful. However, it is advisable, initially when you start trading you should strictly use the money that you have.
I hope this helps.