1) What does Question Mark symbol (?) and hash Symbol (&) means in URL? 2) What are the different types of web servers? 3)What are the different types of Hosting servers? 4)What is the difference between HTTP and HTTPS? 5) HTTP Success Code and Error code? 6) What is Null Pointer exception? 7) HTTP Protocol or HTTP Methods or web GET, POST, PUT, DELETE? 8) Put Vs Post Method? 9) REST Vs SOAP? 10) Client Side and Server Side Validation? 11) Cookies and Session 12) SQL Queries like Join, Aggregate functions, etc