In my previous book I have shown that how you can store details of single person using struct , but if you want to store multiple records then we can use mapping concept there .The code of this is given below

pragma solidity ^0.5.0;

contract mycontract{
    
    struct details{
        string name;
        uint256 age;
        string adhar;
    }
    
    mapping(uint256 => details) user;
    
    uint256 number=0;
    
    function setname(string calldata _name,string calldata _adhar,uint256 _age) external{
        
        user[number].name = _name;
        user[number].age = _age;
        user[number].adhar = _adhar;
        number++;
    }
    
    
    function getname(uint256 index) view external returns(string memory,string memory,uint256) {
        
        return (user[index].name,user[index].adhar,user[index].age);
       
    }
    
   
    
}