I am a 19 year old Computer Science and Engineering student, studying in third year. I have been familiar with and enthusiastic towards the subject from school-time. I'm well-versed with the fundamentals of computing and programming. Now, along with data structures and algorithms, I'm doing an open-source web development course, thanks to Tanay Pratap.
C: it helps me understand the core cocepts of programming
C++: it is sort of a, primary language for me. Mostly used for problem solving and to understand the concepts of OOP. I've also used the STL many a times
Core Java: Being a CSE, I have worked with the core concepts of java and also have completed a workshop of it
Python: I am familiar with the spoon-fed facilities available and hence, also have some mini-projects using libraries like PyGame
HTML and CSS: there is still a lot to learn about HTML and especially, CSS
Git, Github: have proper understanding of version control and also, an experience of collaboration via gitHub
Learning is not complete until we apply the things. Have a look at some web-dev projects done along the course.
Writing down one's experiences and lessons, is a good way of being creative as well as using the time efficietly.