Welcome to the hub!
There's an introduction tutorial here: https://www.color.io/photon/photon-ofx-plugin-3d-color-grading-in-davinci-resolve16
And here's a short video on how to connect the Photon OFX Plugin: https://hub.color.io/post/photon---connecting-the-ofx-plugin-in-davinci-resolve-5ef6346e9698a77edbc4576512
Since Photon is running as standalone software alongside Resolve there are no differences between using Photon by itself or as a plugin so all lessons and tutorials5 for Photon apply to both Standalone and the Plugin version.
Let us know if you have any questions and we'll be happy to help you out!
Jonathan | Color.io7