How to get 500 crowns in ESO?

Could you please elaborate on the steps one needs to take to acquire 500 crowns in Elder Scrolls Online (ESO)? Are there any specific quests, achievements, or in-game activities that are particularly rewarding in terms of crown currency? Additionally, is there a way to purchase crowns directly with real-world money, and if so, what are the various options and their respective prices? I'm curious to know the most efficient and cost-effective methods to reach the goal of 500 crowns in ESO.