update Go types and type assertions (#6260)

* update Go types and type assertions

* Update src/data/roadmaps/golang/content/101-go-advanced/102-types-and-type-assertions.md

---------

Co-authored-by: dsh <daniel.s.holdsworth@gmail.com>

src/data/roadmaps/golang/content/101-go-advanced/102-types-and-type-assertions.md

@@ -1,7 +1,10 @@
 # Types and type assertions
 
+Types in Golang specify the data type that a valid Go variable can hold. Golang has four categories of Types including Basic, Aggregate, Reference, and Interface Types
+
 Type assertions in Golang provide access to the exact type of variable of an interface.
 
 Visit the following resources to learn more:
 
 - [@official@Types Assertions ](https://go.dev/tour/methods/15)
+- [@video@Go Syntax - Type Assertions ](https://youtube.com/watch?v=vtGbi9bGr3s)