I assume when he mentions the Piano Street forums, he's talking about people like Bernhard. The guy was a legend. Some of his posts are collected here by topic:

I assume when he mentions the Piano Street forums, he's talking about people like Bernhard. The guy was a legend. Some of his posts are collected here by topic: https://pianoselfteached.wordpress.com/2015/10/29/contents/ https://pianoselfteached.wordpress.com/2015/10/29/contents/. But, the information density is rather low, so besides the repertoire suggestions I recommend skipping it. This blog does a great service by distilling all his ideas into a short post. For a book-length treatment along the same lines, there's Chuan C. Chang's Fundamentals of Piano Practice: http://www.pianopractice.org/ http://www.pianopractice.org/. His daughters won state piano competitions using these practice techniques. Beware, though, that there are a few crazy tidbits sprinkled in (for example, his claim that if you practice piano while sick, you might cause brain damage). But most of it is useful.