The things that impressed me most from university were:
The language with which I feel very comfortable is certainly Java which accompanied me in my studies and which I still use in my work, in particular the Spring Boot framework. However, I know how to program in many languages including python, nodejs, golang and I am always motivated to learn new ones.
A world I'm becoming more and more passionate about is the design of microservice architectures and their integration in the cloud world, which is why I love Docker and I'm studying and training to become an AWS certified developer.