read a book
Finished reading "Rust Brain Teasers". It's a shortish book that presents you with various snippets of code and you have to figure out whether they compile and what happens when they run. It's a way of exploring some of the common gotchas and other nooks and crannies of the language.

I was quite pleased to discover that there wasn't much new for me here and I was able figure out most of the answers, although the explanations did also help round out my understanding a bit more in some cases.

It was a fun read and the experience showed I've come a long way since I first started to learn Rust in the summer. There are some advanced topics still to explore like procedural macros, unsafe code and FFI before I can claim to be an expert, but my knowledge is growing every day!