Top things a Web Developer should know
A good web developer should familiar with these things regardless of the language or skills or framework, he/she specialized in.
Git & GitHub: Git and Github are version control system and quite popular compared to others. Working on huge project and a large team, you definitely need it. Learn operations repositories, pull requests, commits, merging branches, etc.
Consuming API: Learn to use third party data/APIs. There are many public APIs.
Building REST API & CRUD: Building backend APIs and working on a database(MySQL, MongoDB). POSTMAN is a good tool.
Authentication: To track your users if they’re allowed to create resources/access. Few terms are cookies sessions, JSON web tokens, etc. including third party authentication like Google, Gmail, Twitter, etc.
Problem Solving and Searching: Skills to solve the problem using algorithms. Like searching operation.
Writing test: Testing is important also documentation.
DevOps & Development: Developer must be familiar with deployment/hosting of application. Working on AWS/Google cloud is best nowadays.