Lightning Network (original white paper) Sections 1 - 3 (three times) - see https://tamalpais.atlassian.net/wiki/spaces/LosGatosRG/pages/660340737
Lightning Pool (white paper) - Sections 1 - 5 - see https://tamalpais.atlassian.net/wiki/spaces/LosGatosRG/pages/660340737