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.

Just count your fingers, if you’re dreaming there will be way more than 10 of them