I don't think Albert Einstein was a Marxist (most likely some other type of socialist) but I think “Why Socialism?” is a good beginner text for people studying Marxism for the first time:
https://www.youtube.com/watch?v=lu8lQKVcbOs&list=PLJgjf-ClNObMmMsjN3DEW9BK444Cq1JBb&index=2&pp=gAQBiAQB0gcJCX4JAYcqIYzv
https://www.youtube.com/watch?v=lu8lQKVcbOs&list=PLJgjf-ClNObMmMsjN3DEW9BK444Cq1JBb&index=2&pp=gAQBiAQB0gcJCX4JAYcqIYzv
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I can forgive him for not looking at the dirty details of social theory.