@ manish
in solid state , u have to only use your imagination , that chapter only uses imagination and creating the concept ,
the imp topics are (for boards )
1- tetrahedral and octahedral voids "
2- frankel and schotky defect
3- all types of defect
4- density calculation problem
5- calculating the octahedral and tetraghedral voids
6- n and p type semiconducter
7- concept of curie temperature
8- diffrence between hcp and ccp .
u can refer to askiitian website for imp ques , revision notes , and study material .
all the best ..