The Target variable will be a input once this is reached don't take and more trades for the day.

Just a question will this work. This is on time function not on tick as there might not be ticks at the desired time.

I see there is second, third and forth periods that can be used in one block but not sure if im using them in the right way

I would like to know how one would build a simple EA that opens a trade i.e. buy at 3min before the next 15min candle.

example

Buy at every 12th min, every 27th min, every 42nd min and 57th min.

Target variable = If this variable is reached don't take trades for the rest of the day.

Thanks in advance.