I found 4clojure great when starting out as well. I am definitely more of a 'hands on' learner, so these exercises were great for me. However my absolute favor

I found 4clojure great when starting out as well. I am definitely more of a 'hands on' learner, so these exercises were great for me. However my absolute favorite language agnostic tool for learning, like you, is Advent of Code. I try to go through all 25 whenever I'm learning a new language, and sure enough by the time I get to the last one, I pretty much know what I need to know.