Photos
How do I sync my iMac Photos to Photos on my iPad
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The easiest way would be iCloud Photos. It will keep the photos libraries on the iPad and the Mac always identical. See: Use iCloud Photos to store photos in iCloud – Apple Support (UK)
You would need enough cloud storage to host your complete Photos Library, however.
You can also sync selected albums to your iPad using the Finder (or iTunes, on older system versions).
See: Sync photos between your Mac and iPhone or iPad – Apple Support (UK)