I already had a lot of knowledge of a certain topic or field, but I never had any formal education in it. I gained my knowledge and skills because I used it for my work for a long time. Of course I only learned about the specific things which I needed, so there was also a lot I didn't know yet. Then I took a course on the field, which gave me a more general overview of the whole field and reviewed all the most relevant topics.
I am looking for a word to fill in the blank:
To _____ my knowledge of this field, I recently took a course.
To "solidify" jumps in my mind, but I don't think that really means what I want to say. "Fill in the gaps in" seems a bit too weak, since that seems to imply only very little still needed to be learned (or am I wrong?). Is there any other word that might convey what I am trying to say?