El Chupacabra is a good one. I'll even pay you to kill it for me, as I am tired of finding my chickens and sheep with no blood left in them.
Recommending monsters to kill is impossible without knowing your primary goal for killing (such as for experience or money) and your combat level. There are thousands of possible monsters to kill.
Sell items, Kill monsters, quests.
Kill monsters and get money. Buy new weapons and kill even more monsters. Repeat ten billion times.
KIDS can kill monsters!
Kill monsters, complete quests and sell items.
Beause no matter what you own, the monsters still want to, and will try their best to, kill you. If you have a problem with monsters spawning in your house just place torches and it should be ok
Space Bar
You can read levelling guides on various websites such as StrategyWiki or GameFAQs.Basically you will need to kill mobs as efficiently as possible, and Money helps making levelling faster. The guides should also tell you which monsters to kill, which skills to use, and which items to buy.
Monsters will try to kill you as soon as you are with in 16 blocks range of them, the range may be different for some monsters
there aren't really many profitable monsters to kill in f2p. if you are not planning on training prayer, you can kill moss giants and sell the bones. you can kill cockroach soldiers for some ok cash but you should wait till you get higher def. you should try to get a longbow sight its a good item for training on high def monsters like cockroach soldiers or safe-spotting greater demons in wildy volcano.
You do some mining, fishing, or woodcutting, or kill some "monsters" such as cows, and sell whatever you get at the Grand Exchange.
yes. sell things in G.E. kill monsters lend rune weapons. (if you have bought one).