App not showing up on the home screen
This can happen for a number of reasons and you might not know why.

First, do the easy stuff, like you already did.  Search with Spotlight, check for a new Home screen by swiping to the right, and check all your folders.

If those don't work, try a hard reset.  After you restart the iPhone, search for the app again.

If the app is still missing, delete the app and reinstall it from the App Store.  To delete the app (in iOS 11), go to Settings -&gt; General -&gt; iPhone Storage and find the app.

Tap the app and on the next screen select Delete App.  

After the app's deleted, go back to the App Store and redownload the app again.  Hopefully, it will install correctly this time and you'll be able to see it on a Home screen.