C Programming Tutorial - Nesting if Statements

run this code it will explain everything.

#include<stdio.h>

int main() {
int age;
char gender;
printf("How old are you?\n");
scanf(" %d", &age);

printf("What is your gender? (m/f) \n");
scanf(" %c", &gender);


if(age >=18) {
    printf ("You may enter this website!");
   
    if(gender == 'm') {
        printf(" dude");
    }
    if(gender == 'f') {
        printf(" m'lady");
       
    }
}
if (age<18){
    printf("Nohing to see here!");
}
 
}