What is “The level of processing theory”?

The level of processing theory states that the more deeply we process information during encoding the better we will remember it. For example, trying different approaches:Structural: Is the word written in capital letters? Acoustic: Does it rhyme with the course? Semantic: Does it fit in this sentence? Intentional: Memorise the words. A study by Craik, F. I (1977) found that semantic and intentional memorization had the best effects. (deepest processing)