(1) The second link you give shows nothing - so we can't see the computer analysis. Luckily, I don't have to in order to analyze this game.
(2) The move "b6" is never played by either side in the game you are showing with your first link. Usually, I can figure out typos and mistakes players make, but I really have no clue what you're referring to here - the move b3, which you played to protect the knight, is not a blunder, or mistake. You need to be more specific
(3) Your opponent was the one who blundered though - he turned an easy win into a draw, then an easy draw into a mate in 2 moves.
I can't tell you all the intricacies of the computer analysis, although I can tell you exactly what you need to work on to improve, based on just this one game:
*Study tactics - you made a lot of serious tactical blunders in this game, especially that one on the 7th move. Any one of these moves will instantly lose you the game against someone who knows even a bit about what they're doing.
*Check your opponent's responses - it makes no sense to play a move without thinking about how the opponent can respond. You need to make this a habit.
*** (3 stars, important) - Manage your time better. You and your opponent both did horribly with time management. If you don't want to play 30 minute, maybe you should play 5 minute instead. But you should use your time to think about the moves.
If you seriously follow this advice, it will make you a stronger player.
So I had this game where I made a tremendous amount of errors and still managed to win through errors of my opponent.
https://www.chess.com/live/game/1951489692
I saw when I got my queen and knight forked that there was a tactic after the game where I could have gotten both his rooks and kept my queen. I understood the computer on that line however, there are a lot of Inaccuracy, Mistake's, and even Blunders that I just don't understand why or how there bad moves. In this game most of them were pretty easy to understand.
This one however, I don't understand how the b6 move was a blunder yet the computers move was to me the blunder as it just gave him a Bishop. When my move protected my pieces.
https://www.chess.com/analysis-board-editor?tab=computerAnalysis&flip=true
I see after all of it was over in that line that were both about the same but, I just don't understand how my move was considered a blunder.