The PDF, or Portable Document Format, was designed as a reliable way to exchange documents independent of software, hardware or operating system. As such, it is has become a popular method of sharing a variety of documents, including photos. You can put your photos in a PDF and share them from the Photos app on your iPhone or iPad, though the feature is not at all obvious as it is found under "Print" in the sharing options. Here's how to put your photos in a PDF file and share it on iPhone or iPad:
iOS 12's Shortcuts app has hundreds of useful shortcuts meant to make a variety of different tasks easier to accomplish on your iPhone. A reboot of the old Workflow app, Shortcuts has a gallery of pre-programmed 'recipes' that are basically small programs that use one or more apps to achieve a desired result. For example the Remind me at Home shortcut will remind you of a task as soon as you get home by using location services, Maps and Reminders. You could set this up yourself as a location based reminder, but the shortcut makes it considerably quicker and easier to do.
Every photo you take with your iPhone has associated data that you can view such as the time and date, location, camera information and more. You can also add titles, descriptions and keywords to your photos which makes them a lot easier to find with the search function. While Apple is always improving its photo search function, there always seem to be photos that are missed when you search for a keyword.
Every photo you take with your iPhone has metadata attached to it - information about the photo like what camera it was taken with, the coordinates where it was taken, date, time and more. You can add data as well, including a title, description and keywords to facilitate search results. The Photos app is able to detect faces, and if there are any faces in a photo that you have assigned names to, and the app recognizes them, then those names will be in the metadata as well.
The Photos app is seemingly improved with each new iOS, and this holds true with iOS 12 as well. In addition to improving the search function (allowing you to search by place or event and multiple keywords), allowing for editing RAW files, and an overhauled Albums layout, Photos in iOS 12 adds a For You tab that includes a number of features. Here's an overview of the new For You section: