For a basic intro, I would recommend “Principles of Communism” by Engels. It’s a super quick read, and it’s organized in a FAQ format.
Beyond that, it really depends on what in particular you’re interested in. For economics, I can highly recommend “23 things they don’t tell you about Capitalism” by Ha-joon Chang (although it’s more about capitalism than socialism). For learning about the state, nothing compares to “The state and revolution” by Lenin.
Funny that after the report was released, all my lib friends seem more convinced than ever that there really was a lab leak. The media really doesn’t care at all about the facts on this one