I am just putting forward a few suggestion to ease your confusion.
1) In case you need to change lane please use indicator to do so. This gives ample time for traffic behind you to control their vehicles.
2) Never overtake any vehicle from left side and neither let anyone overtake you from left side. In India, over taking from Right side is the correct way.
3) Whenever you see some traffic approaching you from the right side on a circle or at a faulty signal crossing then please slow down and give them the way. Never take a turn or cross at high speed.
4) Here is a basic theorem for safe driving which I learnt from my dad. It is called the 3A Theorem.
Hope the above help your cause.