Ask HN: Which of the following ML topics do you wish had good tutorials?

<p><pre><code> 1. Distributed Reinforcement Learning with RLLib 2. Distributed Deep Learning with PyTorch 3. Reinforcement Learning with PyTorch 4. Linear Algebra for ML with numpy 5. Other (please specify) </code></pre> I like to teach what I learn and have a few tutorials up on YouTube. I need your help in figuring what should I put up next.