The Games Cabin Writes:

“PvP differs from PvE in that you really need to know the basic toolkit of every class before you can truly shine. Getting caught off guard by an ability, or string of abilities you didnt even know existed will really hinder your performance. We strongly suggest learning a bit about each class or if you have the time, test them out by getting them to level 26 (Which should only take a few short hours per character. The game also greatly encourages playing multiple characters at high end PvE)”

Source: N4G PC Lost Ark PvP Tier List 2022