I get its a Tarantino movie I may be missing something. This film seems not to have an arc.No villain or a great issue to overcome.
We see main leads, functioning alcoholics who smoke two packs a day making their way in Hollywood. Cliff Booth connects to jailbait hippies (supposed followers of Charles Manson) that track him to Dalton's house where they are killed in Tarantino fashion. Then Sharon Tate whose vibe is entitled but expecting of the special treatment I don't see why Tates character was included. IMO it would have been a better use of SD card to develop the main characters.