when an app is hanged, how doni reset it or reopen it?

Hi ElOriental,

welcome to the Apple (user-to-user) Community!

Re: "when an app is hanged, how doni reset it or reopen it?"

Seems you should close an app only if it is unresponsive:

How to: Close an app on your iPhone or iPod touch - Apple Support

Eg: says:

"for iPhone X and later

1. From the Home Screen, swipe up from the bottom of the screen and pause in the middle of the screen.
2. Swipe right or left to find the app that you want to close.  
3. Swipe up on the app's preview to close the app. "

For more info: You can view an animation in the linked article above.

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Re: "theres got to be a way, can someone tell me?"

More on what to do:

If an app on your iPhone or iPad stops responding, closes unexpectedly, or won’t open - Apple Support

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Re: "Theres one improvement i would like to suggest to Apple, where do i send it?."

Be sure you are giving this suggestion away for free if you send it to Apple.

( Apple’s Unsolicited Idea Submission Policy )

Apple Support has a feedback web-page online, where you can choose an iOS app, or the iPhone, etc.

to send feedback to those who work behind-the-scenes at Apple.

(They will likely not reply, yet your feedback will be carefully read or considered, and logged.)

A web-form will open for your feedback

Product Feedback - Apple

All the best :-)

Thank you kindly for letting us know we helped, ElOriental 😃