One shot programming

Under what conditions am i to use the pulsed inputs and under what conditions am i to use the normal inputs?

eg:
pressing a start push button will switch on an output
Even a rising edge of start pushbutton can do that
Without rising edge also we can do

Tell me the circumstances as to when rising edge could be used in the programming?

as an example if your pushbutton is a momentary pushbutton, and when you press the PB you want the output to stay on and when the same PB is pressed again it will turn off. This is commonly done with a one shot.

when you press the PB you want the output to stay on and when the same PB is pressed again it will turn off

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This will open up the flip flop topic that was started late last week.
The use of a One shot is totally application specific, some people use them all the time, some only when the application dictates the need, some not at all.

Under what conditions am i to use the pulsed inputs and

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Sounds like you are referring to a HSC input, if so, this is totally different again.

In general, you use a One Shot when you only want the action to be performed once whilst the condition is active. This is necessary due to the nature of the PLC scan.