Sure - happy to explain.
Please note that even though these permissions are listed in the Store, Diarium does not automatically has permission to do all these things! For most things (location / microphone / calendar / contacts / ...) the app shows a permission prompt asking you to grant the permission required for a certain feature. You can also see what permissions are currently active for Diarium in the Windows settings and revoke permissions if wanted.
Use to get your location automatically when adding location to diary entry. Permission can be declined and you can enter a location manually
Needed for audio recording + dictation feature
Needed for reliable sync even after app is closed - normally, Windows UWP apps only have 15 code execution time after the app closes/minimizes. This permission extends that time
Similar to the last permission, this one allows Diarium to keep recording audio when the app minimizes. By default, the app would not be able to record audio when minimized
Access your Internet connection
Needed for Cloud Sync, most of the "feeds & events" integrations that can be enabled in the app settings, crash reporting/analytics and more
Access your home or work networks
Required for WebDAV sync when the sync server is in the local network
Use the appointments in your calendar
Used for the system calendar integration
Use your pictures library
Used for the automatic "Camera Roll" integration
Is used to suggest your contacts name when adding people-tags