battery

A full shut-down of your iPad will do no harm to your iPad battery - but you should not store an iPad with a low battery, as this can cause irreversible damage to the battery.

Unless you don’t intend to use your iPad for many days, there is neither need nor technical benefit to fully shut-down the iPad; while sleeping, the iPad can continue to perform background housekeeping - including responding to notifications and alerts etc - while consuming minimal battery power. A sleeping iPad can easily sustain a week or more without requiring recharge.

Yes, feel free to power off the iPad whenever you wish. It is not bad for the battery.

In fact, no iPad or iPhone is powered on while it's new in the box before being sold to a user.