How do I use my Synology DS124 NAS on Windows 11 and iPad OS/iOS devices, and do I need to configure my router for it?

I’m very new to personal cloud storage and wasn’t sure if I needed to download an application to my computer and Apple devices, configure some router settings such as DNS (I have dynamic IP), or even generating some sort of email address used for accessing the NAS outside of the WiFi router.

Also, is it bad to power off the NAS each night?