Java

• Base:
• Inheritance, Composition, Sealed
• Switch & Records 
• Exception Handling
• Collections
• Multi Threading
• Multi Threading through a story
  
• Generics
• Functional Programming
  
• Web Services
• Java memory and GC
• Visual VM
• Heap dump
• Testing, Mocking
• Clean code,Design Patterns
• Framework
• RegEx
• Spring