Group many individual facts together meaningfully in a few "chunks". Our Brain likes groups, not random bits.
Repeat facts in your head and out loud with increasing intervals: 5 min, 20 min, 1 hour, 8 hours, 2 days
Facts you are tested on are remembered better than untested facts. Do mock tests and quizzes to verify your knowledge.
Facts you write down and say out loud have higher recall. Tell others what you learn so your body "produces" the facts.
Schemas are mental templates of context + old facts. New facts fit into old schemas in a web, so learn contextual details. More context = stronger schema.