I would say you should be level 50+. You could be lower but with better food.
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3, there are safe spots there...
The strongest monster in f2p should be Revenant Knight (lvl 126) I think. Can be randomly find it Wilderness. They have ability to freeze you and deal hard magic damage. Now that the revs are moved somewhere no one knows of so the highest now is a Greater Demon but now i think they cannot be found anywhere but the wilderness now and that is pvp so the highest is definitely Lesser Demon at level 82.
XP is not calculate when you kill a monster, but every time you hit it. You get XP for every damage point you inflict. In the case of magic spells, you also get a basic magic experience, just for using the spell. I am not sure about ranged.
Of couse!If your asking about nonmember monsters, then there is the level 83 lesser demon that has a rare rune medium helmet drop. There is the level 82 Cockroach Soldier that has a rare drop of a rune scimitar or a rune kiteshield. It also rarely drops runite ore. Greater demons also drop rune items: they are found at the demonic ruins and in the Wilderness Volcano.For more info check out the RuneScape wikia website.
about level 90, monkfish have better xp and are faster to catch.