Turn off and on Ipad 10th generation

there is a on off switch on the top of it

try reading Turn iPad on or off - Apple Support

Perhaps the easiest method to turn-off an iPad is from iPad settings:

Settings > General > Shut Down

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

The iPad User Guide is a rich source of information for using your iPad and iPadOS. Here is a direct link to the section that describes turning your iPad on and off:

Turn iPad on or off - Apple Support