[reactspa]

I'm very interested in the "shadow" concept, am always curious what people really mean when they mention it.

If you could elaborate on your mention of "shadow", (perhaps "Explain Like I'm Five"-style), I'd appreciate it. But I'd understand if you don't care to.

[ayewo]

I parsed "shadow" in this context as things that challenge you emotionally as person.

Personal difficulties that you'd rather pretend to not exist like a drug addiction. People who run from their shadow avoid having an honest conversation with their self. An honest conversation requires one to confront personal difficulties head on, in order to final a (lasting) solution to their negative effects.