It's my first interview! Help and guidance needed.

13th July is my first f2f interview. It is a startup using vue.js. They called me as I have mentioned React in my resume. The email they sent me is as follows

"The interview will consist of just an understanding of your background. Along, with that I will ask you some theoretical questions to test your knowledge and have you write some short programs to test your skill."

Can someone please guide me as what theoretical questions and programs I should expect and prepare?