Guild Wars 2 is ArenaNet's MMORPG, released in 2012 and on Steam since 2022. You create your own character in Tyria, play your personal story and join shared events across the maps. According to the official wiki, the entire core game has been free to access since 2015, while expansions are sold separately. Turkish is not in the language list on its Steam page.
This guide is for players who have just started, or who are surprised in the early levels: "don't I need to pick up quests like in other MMOs, and why do my skills keep changing?" Guild Wars 2 breaks a lot of habits: instead of reading quest text you explore the map, and instead of standing still you move to avoid attacks.
Keys, numbers and mechanic names come from the official Guild Wars 2 Wiki (wiki.guildwars2.com), which ArenaNet links to.