Transfer music from PC to iPad

Sync iPad with your computer - Apple Support

Connect the iPad to the PC using the cable and give all required authorizations when prompted; you should now see an iPad icon in your iTunes; click on that, then simply choose which files you wanna copy to the iPad.

This comprehensive guide to using iTunes on your PC, to synchronise music and files, should be helpful to you:

https://www.imore.com/how-sync-your-iphone-ipad-or-ipod-windows-10

Whilst this article is written for Windows 10, it is equally applicable to earlier versions of MS Windows.