Find something in the Star Wars universe that interests you, then read the wookieepedia
page about it, follow the links the associated things and learn about them too. Once you get a solid grasp of the basics, memorize the general timeline. Afterward continue on to reading books. Eventually you'll consume much of the vast universe's knowledge.
That's how I started and 4 months later I'm reading the aurebesh
signs in game without a translator.