Aside from practice, of course, it depends on the genre. Most of the time though, I find that looking for the community and consuming some of the content they create is a quick way to get up to speed on the "meta". Simply observing good players on YT, or reading comments on the subreddit, etc., will help draw the map from beginner to expert level. That allows to focus on specific tactics or aspects of the game that are low hanging fruit (in terms of making improvements).