Free Step Dodge

Here's a couple others: https://www.freestepdodge.com/threads/how-to-use-frame-data.224/ & https://www.youtube.com/watch?v=kM5ef903EXw&list=PLV4Z7LoRwodBYCiMNOVwLGY75qkNNlNTv&index=11&t=19s

Basically every move from every character has Startup (Time that it takes for a move to connect), Active (Time that the move will actually connect), and Recovery (Time after the move before another action can be taken) frames. As for whether an attack is positive or negative on block and hit, those values are different, and a comparison of Recovery frames vs Hitstun or Blockstun depending on whether you connect.

I found this thread by Sly Bass extremely helpful. Short, simple, easy to understand. https://www.freestepdodge.com/threads/frame-data-explained.5412/