Know the definition Of

$-$ Model

$-$ View

$-$ Notation

$1)$ The difference between objects and class

$2)$ difference between include and extend $3)$ name essential elements of design pattern you can mention like $4$ or $5$

$4)$ why do we need design patterns?

$5)$ UML diagram for factory method and Singleton with their pros and cons $($advantage and disadvantages$).$