WANT TO INSTALL iOS 13 RIGHT NOW?, FOLLOW THIS TUTORIAL TO INSTALL iOS 13 PUBLIC BETA.
First of all, If you want to know whats NEW in iOS 13 Follow this link to know the top features coming with iOS 13-LINK
STEPS TO INSTALL iOS 13 BETA:-
Head to Apple's Beta Program website via Safari on Your iPhone
If you're already a member, click "Sign in" If not, choose "Sign up", Enter your Apple ID information, and agree to the terms and conditions.
Tap the "Enroll Your Device" link and make sure you're on the iOS tab of the interface
Apple will recommend that you perform a backup using iTunes; this is not mandatory but it's HIGHLY-RECOMMENDED
Scroll to the install Profile section of the website and choose "Download Profile"
Once you authorize the download, open the settings app on your iPhone
Along the top, you should see message saying you have a profile ready to be installed; tap that and install the profile as seen in the screenshots above
Your iPhone should now restart to complete the profile installation
Once your iPhone has restarted, go to Settings >-- general >-- Software Update. You should now see the iOS 13 update ready to be installed.
ONCE YOU'VE COMPLETED THE INITIAL INSTALL OF THE iOS 13 PUBLIC BETA, YOU'LL RECEIVE UPDATES OVER-THE-AIR JUST LIKE YOU WOULD FOR ANY OTHER iOS VERSION.
You can install iOS 13 on the following devices-
iPhone XS max
iPhone 8/ plus
iPhone 7/ plus
iPhone 6s/ plus
iPod touch (7th Gen)