Polished my Golang skills and Python skills.
Studied the Deep Learning Book Theory and toy examples with Keras and Torch.
Some good ol C by implementing linear solvers.
Understood the inner workings of bitcoin and started working on a better version of it. Most of all the month I spent pouring on Homomorphic Encryption literature was very useful.
I also went trough some cryptography books (math from Koblitz book and Serious Cryptography).
2018 was less of a tech year for me as I spent more time doing mathematics (love it) and reading various books about (cognitive science, evolutionary theory and math textbooks)
For 2019 since I'll be graduating I think I'll spend more time on mathematics, reinforcement Learning and OCaml which I was postponing this whole year. And of course Rust.