Excellent question, although it can be interpreted a few ways. I'm by no means an expert, but here are a couple that I've taken a look at -- if you have more detail around whether you're thinking about storage structures (i.e. LSM trees vs. B-trees) or actual data types (string, int, etc), let me know and I'm happy to share more: https://medium.com/@shivendrasingh410/modern-data-structures... and https://www.interviewcake.com/data-structures-reference