Transfer apps from one iPad to a new iPad

You don't really. Back up your old iPad. Log into the new iPad with the same Apple ID and restore it from the back up you made from the old one. That back up includes a list of the apps which will then be downloaded from the App Store to the new iPad.

See this link for the ways you can easily migrate from the old device to the new device --> Transfer data from your previous iOS device to your new iPhone, iPad, or iPod touch - Apple Support