1.Progarmming Language
Low level ;Machine language,Assemly language
high level Language; Procedure language,Object oriented language,Data base query language..

2.Java b buzz world
3.Number system and conversion(Binary,octal,Decimal,Hexadecimal System) 
4.Computer Architecture(Primary and secondary memory, Input/output devices,CPU)
5.Network(Types of network(LAN,WAN,MAN) Topologies(Star,hybrid,Bus,mesh))
6.Inheritance,Poymarphism ,Incapsolation 
7.If else statement
8.Switch Statement
9.loops and nested loops
10.Arrays
   Programs
1.Grade
2.Calculator
3.Table(simple loop and nested loop)
4.Factorials
5.one dimensional  and 3 dimensional array..