How can I better understand punish game as Marth?
I'm a bad Marth player -- still working on consistency with SHUFFL, ledgedash, etc. I'm kinda starting to learn about neutral and defense options, but when it comes to punish game and/or combos, I'm helpless. I get a grab and it goes nowhere. I hit a couple up-airs and then my opponent just double-jumps away.
I know it's important to keep working on movement and tech, but I feel like I'm missing something fundamental about punish game and combos. I don't even know what/how to practice. Anyone else struggle with this? Any tips?