What are the changes from 8.5.2 to Infinity’23?
Can you just give us the release notes?
Please can you carry out a PSC key word search as this will show you the answers given in similar questions.
eg Pega Infinity Deployment Changes FAQs
Pega Upgrade from 8.2 to Infinity 23
Similarly did you check the main pega website?
There is also a video that comes up when you carry out a search: Introduction to What’s New in Pega Infinity ’23
You can find the release notes on our documentation server: Platform '23 release notes
For upgrade process start here: Installation and Update Documentation Roadmap