Hello fellow Computer Scientists. Today I decided to get start picking up programming languages I haven't used for a while now. The reason is because I got a job where I learned a new programming language and use 3 that I already knew. I learned Clojure and I use java, JavaScript, and SQL. Anyway, back in college I used C, C , Java, and Python. During my free time a while back, I used to write small house projects for fun with the languages I mentioned before. However, after a year developing in Clojure, JavaScript, little to nothing with java (Clojure interoperability with Java), and SQL my other programming languages have become super rusty with dust all over and spider webs. I want to pick them back up. I started going into leetcode.com to have an interactive learning challenges. However, I keep Googling simple stuff I used to know by memory. I currently do not use Google for Clojure but for when I have to use a Java class in Clojure. I used to be like I am with Clojure with C, C , and Python. Maybe, read the API or so.

How do should I pick them back up again? Where do I start? I can define variables, structs, several data structures and so on. Is reading a book on the programming languages I mentioned would help me out or should I pick back up my college notes? What you all think is tbe best?

Thank you.