How do I transfer all data from IPad to laptop

I cannot speak to "Hangouts" conversations

Transfer photos and videos from your iPhone, iPad, or iPod touch - Apple Support

Mail is complicated... it depends on what you may mean by "saved emails" - saved to where now? How? As what kind of files?

Tell us a detailed story about this

Can you please explain what you mean by:

• "all data" - pictures, videos, what else?
• "transfer" - back up? archive(save to disk)? Both?