The sentence, "You can also comment a line or a block of code if you don't want to delete it it's not needed it at the moment." should read, "You can also comment a line or a block of code if you don't want to delete it BUT it's not needed it at the moment."
The sentence, "You can also comment a line or a block of code if you don't want to delete it it's not needed it at the moment." should read, "You can also comment a line or a block of code if you don't want to delete it BUT it's not needed it at the moment."