To summarise it. Go through rooms, fight monsters and use your skills to get to other rooms. Every dungeon floor has a boss, once you defeat it you complete the dungeon and you get experience for it.
It is quite fun when doing it in groups, however it is awful as a skill imo.
omg dude what ytour asking for is too much but ill try...
Dungeoneering is a skill made my jagex obviously that resembles a minigame. When you begin a dungeon you start off in the starting room which is called your "base" you can click the home teleport button at any time to teleport to your base and regroup or if you just need something. The smuggler is essentially your shop (if your not sure what an item is use it with the smuggler and he will tell you) he sells everything from ores to anti poisons and tools. basically the floor you can access starting from 1 going to 35 can only be reached depending on your dungeoneering lvl. for example. if you need lvl 8 dungeoneering to access floor 5 and you have 7 dungeoneering. you will have to repeat either floor 1 2 3 or 4 until you level up to 8 dungeoneering. there are various puzzles within dungeoneering (most are obvious and can be understood right away) and others being mroe challenging in which you have to work with a team mate. usually these puzzles have a required skill level which one will need to complete the room and advance to the next room. other doors with just monsters inside it are called guardian doors which will open once you have defeated all other monsters. lastly there are key doors and these are simple. you just need to find the corresponding key to match each door. another thing you need to know is prestige. by repeating a floor you recieve 0 prestige and your prestige can range from 1-35 depending on how many floors you have done.In order to maximize exp you will need 35 prestige but that is only available at 65 dungeoneering. the only way to gain prestige is by completing a floor you have never completed before thus gaining you more exp. however if you complete the floro a second time you recieve less and thats when "resetting comes into play. It is wise to reset after you have completed all the floros you can at your level then complete them all again after resetting. when you start dungeoneering you can "bind an item" this means that the item you bind stays with you every time you enter or leave a dungeon. when you get 50 dungeoneering you can bind 2 items (most people just bind a platebody and a weapon)