Structs and classes are almost identical in C++. The only difference: struct members are public by default, class members are private. Everything else works the same. Use structs for simple data containers where you want all members accessible.
Use classes when you need encapsulation, hiding details and controlling access through functions. you'll cover classes later. For now, structs are great for grouping related data without complexity.
When you need methods and access control, you'll graduate to classes.