I'm very bad at fighting games. Sadly, I love watching them being played by good players. I wish I had that kind of hand-eye coordination. I can't do combos and I do not possess the dexterity needed in my fingertips to execute a decent fighting move. Oh, I hate that.
Hello Lamanlupa/Julez, it is I, iCoachU, here to rescue you. You see, I used to be bad at fighting games. You do not possess the dexterity...yet. You see, dexterity is an understanding of time and a result of intelligent repetition.
It is not about YOU, it is about your HANDS. You must think, watch, understand your opponents. Your hands must do what they do instinctively.
And to do that, you must condition them.
Whatever fighting game you have, turn it on, hit training mode. Your goal is to use your normals, do not hit the opponent, but just trigger the normals. For example, crouching light punch, medium, heavy. Do each one of those 50 times in a row, slowly. Observe. Silence your mind. Allow your eyes to witness them, allow your fingers to get used to the input. Repeat for each. Aim for 500 repetitions. Aim for 1000. As you repeat, you advance. You can witness things you never noticed after 1000 reps.
Combos are simple understandings of chains and transitional moments. You must learn to slow down time, to practice hand maneuvers in slow-motion. Reconstruct time without the game, slow your hands to a crawl. Stretch 1 second of inputs into 10 seconds of inputs. Then speed it up to 5 seconds. Then 2.5. Then do it at speed.
It will teach you discipline, skill, timing and intuition. Then you will learn to respect the greats in a new light.
Go practice. It is time.