Khan academy and Schaum's Outlines are your friends. Then some textbooks with exercises (e.g. Axler on lin alg). The notation is usually an expression of a me

Khan academy and Schaum's Outlines are your friends. Then some textbooks with exercises (e.g. Axler on lin alg). The notation is usually an expression of a mental model, so just approaching via notation may cause some degree of confusion.