Many of Nash's things are slow and more predictive. Understanding your opponent is key as well as spacing and such.
For example whenever I fight a Nash I open with cr. mk as Kolin. Stuffs all typical forward movement advances, recovers in time to block things like jump ins or jaguar kicks, well enough time to be safe against fireballs. However, Nash can do his meter steal attack to beat it, or some delayed option, and if I fight someone who does that I know they know what's up. You need to think of things like that to succeed as nash in s2.
For example whenever I fight a Nash I open with cr. mk as Kolin. Stuffs all typical forward movement advances, recovers in time to block things like jump ins or jaguar kicks, well enough time to be safe against fireballs. However, Nash can do his meter steal attack to beat it, or some delayed option, and if I fight someone who does that I know they know what's up. You need to think of things like that to succeed as nash in s2.