I would refer you to this article from a year ago that appeared in Electrek: https://electrek.co/2017/09/01/tesla-battery-expert-recommends-daily-battery-pack-charging/. The article references a battery expert who has done extensive work researching Tesla batteries. However, this article appeared before Model 3s truly hit the market. In a nutshell, for local use, only charge to up to about 80%, and fully charge only for extended trips.