"I the trash bots i always get down on and when luigi gets trapped i usually die."
I really don't know what the first half of this sentence is supposed to mean. As for the Thwomp, I've found that the easiest way to avoid them is to let the character walk all of the way to one side, then start jumping in place as soon as they turn around. If the thwomp is placed above you, stop jumping, then start jumping again when you reach the other side. If the thwomp is not placed above you, just keep jumping.