I would like help starting my 1st plugin please

hi there, hope all had a good new year !


Ok so i would like to make a plugin, i don't know javascript, will this be a problem ?


I wanted to make a plugin that gives an option on widgets for 'mobile view' and 'desktop view' so for example i have a website in the iframe widget but it slows down the mobile loading time, so i would like to make that iframe widget only show on desktop and disable it for mobile view.

Atm i use https://www.w3schools.com w3-hide-small class with their javascript url in the header  <link rel="stylesheet" href="https://www.w3schools.com/w3css/4/w3.css">&nbsp; on my other sites. 


So 1st off how do i start this please ? 



thank you !