As for "Capital", good luck! Marx was a brilliant thinker, but kinda dry as a writer. Engels is better.
I went through about 30% of Das Kapital.
It's boring reading.
Anyway, analysis of a state of UK society two centuries ago is of interest only to historians.
If you want to understand the essence of Marxism, you need to understand his method.
It can be done by studying of modern books/articles.
I see no need in reading of Das Kapital in the 21st century.
P.S. Engels wrote a few independent works but they are no match to Das Kapital.