The built-in Notes app in OS X and iOS is a great way to gather and organize your thoughts. It can be especially powerful when used in conjunction with the Apple Pencil on an iPad Pro (even without the Apple Pencil, the drawing features are very useful).
If you're like me, you know it's a good idea to tidy up once in a while by deleting notes that you know yo won't need anymore (quick drawings, reminders to yourself, etc). A quick swipe on the note and tap on "Delete" is all it takes to delete notes. Because it's so easy to delete, however, you may find yourself deleting notes that you didn't want to delete. There's a quick and easy way to recover those deleted notes.
When a note is deleted, the Notes app simply moves that note to a new folder called "Recently Deleted".
Here, those unwanted notes will be stored for up to 30 days before they are permanently removed. To recover a note from the Deleted Notes folder, simply swipe left on the note you want to recover, then tap "Move".
Next, you will see a list of folders that should look familiar to you.
Simply tap the folder you want to move your note to, and the note will be moved from the Recently Deleted folder to the folder of your choice. This completes the recovery note process.
The steps above will help you to recover deleted notes from the Notes app on your iPhone or iPad. You can also recover deleted notes from the Notes app in OS X by following the same process, only instead of swiping, you simply drag and drop your note to the folder of your choice.