Here are a few, just a fraction, of keyboard shortcuts which were designed to make your life less frustrating. Frustration is when you have a command of 43 letters, cursor at the end, and you want to change the third letter. Or just one path, out of the four you are using, must be changed… And here is where these shortcuts might be a help from god – who in this case is some guy who in the 80s had the same need you have now.
Ctrl+a : Go to the beginning of the line.
Ctrl+e : Go to the end of the line.
Ctrl+k : Delete all that follows.