Bi set up an online examination system, has been more interested in front js,jq, not familiar with the back end, the database is not familiar with

  node.js, question

1. I’d like to ask if it is better to use node as the back-end language and mongo relational database for storage or MySQL (both of which are unfamiliar and need to be learned now). who has any opinions or materials in this regard to learn

The business scale of the project is not very large, only mysql can be fully used.