Heard it first time via Valeriy Manokhin on X. His feed often posts on well regarded mathematical learning materials on archive.org.

Introduction

Tutorials

Papers

Lei, J., G’Sell, M., Rinaldo, A., Tibshirani, R. J., & Wasserman, L. (2017). Distribution-Free Predictive Inference for Regression. https://arxiv.org/abs/1604.04173