Samiul Arafin: You can follow the following as serial if you want:
- Java Collection
- Java 8 features
- JDBC, JSP, Servlet, JSF, PrimeFaces
- SOLID principles, a bit of knowledge of GOF
- Spring Boot, Spring Cloud, Spring Security, KeyCloak, REST and SOAP
- Basic RDMBS keywords, basic query, usage of aggregation functions, Database View, Store procedure, Functions, trigger etc
NB: Don’t try to learn anything quickly. Take your time.