I would always take notes on paper as others have said as I think it helps with retention, at least for me. Even then I would only take notes of equations to m

I would always take notes on paper as others have said as I think it helps with retention, at least for me. Even then I would only take notes of equations to memorise them and things that the lecturers said that were even not explained properly or absent in the handouts/slides. At my university there were recordings of the lectures but I was too lazy/didn't want to waste my time looking up exactly what they said.