[fikama]

Could you recommend any book/article/video about how eBPF works? - I got a bit interested in this topic but couldn't find anything technical.

[vitus]

There are a number of good resources at https://ebf.io, including a couple of links to books. I haven't read those books personally, but I would be surprised if "BPF Performance Tools" by Brendan Gregg isn't worthwhile.