Locking apps

[Brutal biff]

Is there a way to lock apps so they cannot be opened or moved or accidentally deleted as I let my son use the ipad he's 3 years old and is severely autistic

And before anyone would like to flame me about letting a 3 year old use an ipad I find the ipad is an excellent learning tool for young children especially with asd

Thanks

 

[Brutal biff]

Thank you ill try that