Hello sir, hope you are doing well.
Web Applications Consists Of:
Front-End its basically UI (what the user sees)
Back-End its basically Server programming (user cannot see)
What you MUST learn is dependent on what yMore
Having expertise in web applications .
Know how to implement micro services and build development tools like webpack,eslint, babel etc also.
Can do the even most critical tasks like managing local storage and page optiMore