List the main data structures.

The main data structures in Go include:

• Arrays — fixed-size sequences of elements of the same type.
• Slices — dynamic, more convenient wrappers over arrays with the ability to change length.
• Maps — hash tables for storing key-value pairs.
• Structs — user-defined data types that group multiple fields.
• Channels — for communication between goroutines, implementing the CSP pattern.

Example of using a slice and a map:

// Slice of strings
names := []string{"Alice", "Bob", "Charlie"}

// Map for counting occurrences
counts := make(map[string]int)
for _, name := range names {
    counts[name]++
}

fmt.Println(counts) // map[Alice:1 Bob:1 Charlie:1]