Table data nth hide column

 <style>

    td: nth-child(2)---------------- column second

    {

        display: none

    }

</style>

reference:- www.w3schools.com/cssref

Table Data nth background color

 <style>

    td: nth-child(2)------------------column second

    {background-color: red;}

</style>

reference:- w3schools.com/cssref/

Http and HTTPS port in IIS server

 80 for http

443 for https

OSI Model

 Open system interconnection

PDNTSPA

Difference between array and arraylist

 https://www.c-sharpcorner.com/article/difference-between-array-and-arraylist-in-c-sharp/