Long Call Option is basically Long on Call option of the index /underlying stock which is a bullish strategy.
Buy call option if your view on the Market is bullish.
Strategy- Bullish
Risk - Limited on to the premium paid
Reward is unlimited
Breakeven is Strike price+ premium paid
If the Market is Bullish and crosses break even point, you are in profit.
If the Market is Bearish, you will be in loss.
Eg.
Nifty Currently trading at 16200.
You bought Nifty 16300CE July 2022 @ 100 premium of 1 lot size (50 contracts )
So, 100*50= 5000 is the premium paid up for Nifty 16300 CE July 2022.
If the Market is Bearish, and ends up in 16000 on expiry date, you risk of losing your capital is limited to 5000 only.
If the Market is Bullish and ends up @16450 on expiry, you will be in profit of 50*50 = 2500 , though it may be even Higher because the premium will be more because of delta.
If Market is @ 16400 on Expiry, that is the breakeven. So there will be no loss and no profit.
So Buying a Call Option is beneficial only in short term as theta will be decreasing which impacts the option premium.
For 1 point increase in Nifty, delta will increase. As the contract is near to expire, theta also deceases every day so that the premium decay.
*For information about Option Greeks