How do I diversify my mutual fund portfolio?

I have just started trading in mutual funds. How do I diversify my mutual fund portfolio?

ok… Mutual funds are generally used for (long term) investing.
When you are saying

what is in your mind, if you can explain a bit.

Also diversification is pretty specific your needs, risk taking ability , time you want to give etc.
There is no silver bullet or magic formula which is applicable to evey situation.

If you can come up with some idea about your timeframe, goals and investment ability, someone can meaningfully advise on diverisification.