Computer analysis of a few games of mine

Here is the computer analysis of how I misplayed the opening.

Play through the game until you get to the blunder.

Here is a sicillian

Here is the same game.  Click over to the end.  I play rook b8 and the computer doesn't like that.  I had to play on one or two moves to realize that this move misses a fork, leading to me losing a rook.

Well there are a few of my games subjected to the computer analysis.  I'm still trying to figure out how to make the most of the computer, but I figure looking for a few mistakes and examining them might be a start.