Now that we are equipped with this information, its time to go back to one of the situations outlined at the beginning. You recorded something, a last solo, but then you did not like how it turned out and want to discard it completely.
=== copying, cutting and pasting items ===
But, maybe you tried to do this already, intuitively, and found out that if you had made a time selection and then pressed the delete key to erase part of say, just your voice, then as described on the fundamentals, everything else including your voice was gone, and that is absolutely what you did not intend to do. In this case you would:
#make a time selection using the left and right brackets and select the portion that you want to move, copy, delete, ETC
#select the track and then the item that contains the audio you want to remove by using the up and down arrows to select tracks, control plus left or right to select items.
#press shift plus s to split the item at time selection, two items should be created. One before and another one after the time selection
#either go to the beginning of the time selection and then select that very next item, or find the item in the middle, which is the one we would like to erase, and then press the delete key