Absence of Tempo

Have you ever heard of the old line, “A knight can never gain a tempo.” But, what exactly is tempo?
Tempo in essence is making a move to your advantages with intention to pressure your opponent to come up with a defending answer strategy that he doesn’t want to make but no other choice. It is improving your position, forcing opponent and restricts his next move. Anyways, the world of chess is a world of tactics and strategy. In the end, you in an advantage position and ruling the game, setting its beneficial own course of plan in motion. Your opponent will have no other option but to follow your settings and rules. Basic example of tempo is checking your opponent’s king pressuring him to defend.
Let’s analyze the knight for a moment. It moves in “L” pattern, but can jump intervening men. It captures while it moves, the only distinction between the knight and the bishops is, knight can do more. The bishop doesn’t have the privilege to jump. If you position the knight on a black square, it succeeding move is to move it in White Square. Knight always create a pattern of alternating move between Black And White Square.
So, if you would like to check the opposing king caught shuttling between, say g8 and h8, it is the best to be able to go to the dark square. So, your knight has to reach the f7 (white square) when your king finally gets to h8 (black square).
One more case in point,  the knight on g5 and the black king on g8. Let us say it is white to move, his intention it to have it be black to move so that he can check on f7. So, white will be force to move his knight as far away from g5. However, there are still issues because he will end up on White Square, which means that on the next move black will move his king to h8, which is a black square. White will answer back, this time around to a black square while the back king will go to g8. Regardless of what white does, there’s no option for him to move his knight to g5 in such a way to get it to be black’s move with the king on g8. In short, white cannot afford to “lose a tempo”, it is impossible for him to accomplish the task. On the other hand, white cannot “gain a tempo” either. Alternating the colour square, it goes to every move, impossible to gain or lose a tempo. This is critical in many endgames.