the first is harry cleaver. he calls himself an Autonomous Marxist. He's not an ML (Marxist-Leninist). See his website - https://la.utexas.edu/users/hcleaver/

Cleaver wrote a book called 33 Lessons. each lesson explains the corresponding chapter in capital, volume I and what we can learn from it. He wrote the book based on his teaching. he published an updated version in 2019 with Pluto. I'm new to Cleaver so I can tell you he wrote this book but I can't recommend it as such as I've not finished it yet .

The second is david Harvey. he's also an academic marxist. Not an ML. He also taught capital for years. his lecture series is available on YouTube. he published a written version of his lectures with Verso. There's a volume one and volume two, corresponding to capital, volume I and II. the one that kind of corresponds more to Capital, volume III is different - it's called The Limits to Capital.

His website is https://davidharvey.org/about/ . I can recommend Harvey. his work really helped me to learn about marx .

these aren't the only two who have written guidebooks to Capital but they'll give you a flavour of what is available