My hack to improve at a new programming language is to read its grammar. We instinctively try to learn programming languages the same way as we would a natural language, bottom up. But unlike natural languages, programming languages have complete grammars that can be read in a session. This will prime you with the right questions to ask ("WTF is an XYZ?").
Not sure if this is what you're talking about, but there's https://learnxinyminutes.com. It's really awesome when getting started with a new language. If you're an experienced programmer, you can get to a newbie-but-ready-to-write-some-code level after a 15 minute reading on a new language.
Doesn't work for Clojure though :)