What are skills to focus on learning after first year of CS degree?

I’m about to finish up my freshman year for my CS and Math degrees. I feel like my professors have done a good job in teaching the content for the classes, but I’ll need to gain more skills over the summer to be ready to apply for internships later on. I didn’t program much before college so my knowledge is mostly limited to what I’ve learned in class. At this point, I feel like I have decent knowledge in python, java, OOP, and basic data structures (arra