I too am a beginner with concurrent programming—it's a difficult topic to get your head around at first. Some resources that I've found super helpful:

- Dmitry Vyukov's Lockless Algorithms: https://www.1024cores.net/home/lock-free-algorithms

- Jeff Preshing's blog (worth exploring all adjacent articles): https://preshing.com/20120612/an-introduction-to-lock-free-p...

- Bartosz Milewski: https://bartoszmilewski.com/2008/12/01/c-atomics-and-memory-...

- Memory Barriers: a Hardware View for Software Hackers—P.McKenney: https://www.researchgate.net/publication/228824849_Memory_Ba...

I hope you find some of these useful. I've re-read Paul McKenney's paper every 2-3 months in an attempt to get this stuff to stick! :)