I recently wrote a post on for Towards Data Science summarizing most of the technologies and basic concepts that a data engineer should know about - Complete Data Engineer's Vocabulary. I say that it's the complete vocabulary but it really isn't - it tries to cover most of the tech that people are using these days. I'll make sure to keep it updated.
The whole idea was to summarize every technology or concept in 10 words or less - an activity that I thoroughly enjoyed. It's one thing to use a technology or know a concept, but it really gets tough when you have to explain these things to someone else and that too using the minimum amount of words possible.
I have already had a lot of suggestions for additions on the original post. More suggestions are welcome!