Yes it is very dangerous for lower level players as you will lose everything, except for three things.
I suggest a combat level of 110+ a strength level of 90+ and 80+ defense and attack.
If you have these skill levels and the right equipment you will put up a very good fight.
You can still die though even if you are this good so beware.
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In the castle wars minigame you do not lose any of your items.It is a safe minigame,all items are kept if you die during the castle wars minigame.
No. But if you go into the lose all your items portal than yes.
While on RuneScape PVP worlds, if you die, you only lose the items you are carrying, not those in your bank, never in RuneScape will a death directly affect your banked items.
No, it is one of the most dangerous places in RuneScape, if you die you lose your items (except the items kept upon death, of course), and you should therefore only enter it with items you can afford to lose.
If your in a Bounty hunter world +1 you lose everything but the most valuable item you keep. But if you die in a normal world with a skull you lose everything, but you can get your stuff back if you get to your grave in time.