rtCamp Web Engineer interview questions

What is Git/Github and their differences What is cookie and can you store passwords on it What's the hashcode that you see when you type in git log Which is more efficient between JavaScript and jQuery How Encryption and Hashing works and the difference between the two How WhatsApp's end to end encryption works What is join in SQL Is Javascript synchronous or asynchronous What is Virtual DOM

Though the interview was for web engineer they asked CN, SQL, CSS, System design, VCS, and many more I think for most of the questions I answered very well but in some places, I was not able to answer properly and that was a negative point the company wants someone who can answer all the questions and that too in a way which will satisfy the interviewer