Here's a collection of various resources that I've found really helpful over the years:
Technical docs and tutorials
Lie Algebra:
A micro Lie theory for state estimation in robotics (Joan Solà et al): Lecture video, Paper
Tom Drummond's notes
Ethan Eade's documents
Random ML Tidbits:
Feedback in Machine Learning systems:
Short video [Drew Bagnell]
Longer ICML2020 talk [A Venkatraman, S Chaudhary]
Courses
AI/ML/Robotics:
Intro to AI (UC Berkeley CS188) - The Pac-Man projects are the best set of assignments I've ever done.
Statistical Techniques in Robotics (CMU Robotics 16-831) - A great overview of probabilistic and learning techniques in robotics.
Advanced Robotics (UC Berkeley CS 287) - Tour de force of Robotics. The lecture slides are fantastic reference material.
Reinforcement Learning:
Introduction to Reinforcement Learning (David Silver)
Deep RL bootcamp (Pieter Abbeel et al)
Applying to US PhD programs
This document by Prof Harchol at CMU