Basics
Old School Runescape is a point and click medieval inspired MMORPG. In the game you collect resources and fight monsters in order to progress your character. The game has no fire set path or story. After completing the tutorial you start off in the city of Lumbridge (it’s called that because it has a bridge or the river named Lum) and can do whatever you want from that point on. In this way the game is much like more modern sandbox games. The game gives you 23 skills that you can train all the way from 1 to 99. The game also has 164 quests that you can do. Each quest is like a standalone story where you must solve puzzles or fight monsters. When it comes to monsters there are a lot of small unique monsters as well as larger boss monsters. There are 61 of these bosses. Each one has unique machines and drops unique loot. You can use the loot you get to make your character stronger or you can sell it to other players so you can buy even better loot.
This is a link to the game's wiki page.