I concur about using these resources, with one caveat. The PCF (Prostate Cancer Foundation) guide seems (to me) to have a bias against Proton Beam Therapy. They label it “experimental”.
It’s my impression that PBT may be a very effective focused treatment for prostate cancer metastases; minimizing ancillary damage from traditional radiation.
Some resources regarding metastasized prostate cancer the Prostate Cancer Research Institute:
Advanced Prostate Cancer Support Group Leader:

16 Years Surviving Metastatic Prostate Cancer:

Overview Advanced Prostate Cancer Treatments

One of the things to remember with Prostate Cancer is that diagnostic tools and treatments are evolving rapidly. Since my own diagnosis 11/2019 and PBT treatment 01/2020 the new PSMA pet scans have been approved and new treatment regimes. Perhaps I am optimistic, but I would say that where we are now is not where we will be in two years time.