I think that's my fault BTW (Railway Founder here). I asked Charith to cut down a bit on the details to make sure it was approachable to a wider audience (And most people have only done Cloud)

I wanted to start off with the 101 content to see if people found it approachable/interesting. He's got like reams and reams of 201, 301, 401

Next time I'll stay out of the writing room!