JuniorTheoryCommon

What happens when this program is built and run?

package main

import "fmt"

func main() {
    var p *int
    fmt.Println(*p)
}

Panic: runtime error: invalid memory address or nil pointer dereference

Expecting 0, as when reading a missing key from a map: *p reads the int at the address in p, and a nil pointer has no int behind it, so the program panics.
Expecting <nil>: that is what fmt.Println(p) would print; *p asks for the value behind the pointer, not the pointer itself.

JuniorTheoryCommon

package main

import "fmt"

func main() {
    var p *int
    fmt.Println(*p)
}

Panic: runtime error: invalid memory address or nil pointer dereference

Expecting 0, as when reading a missing key from a map: *p reads the int at the address in p, and a nil pointer has no int behind it, so the program panics.
Expecting <nil>: that is what fmt.Println(p) would print; *p asks for the value behind the pointer, not the pointer itself.