I lost my notes from the app on my iPhone how d...

For some reason I lost my notes saved on my Notes App. How do I restore from the iCloud

If you have previously synced your notes with iCloud, then go to Settings>Your name(for iOS 10.3+)>iCloud

Check in ‘Apps Using iCloud’ and enable notes there and wait for a few seconds and then open the notes app and you’ll find all your notes.