No trade - this checks if there is a trade currently running or not
Once per bar - this is a filter and can pass 1 time for the current bar - in the beginning of the bar, in the middle, in the end, nevermind. Only if this block is on top level it passes in the beginning.
Condition - this compares some things at the current moment and passes if the comparison is true
Sell now - when this block is run, it creates a new Sell trade
