How do you kill monsters?
you can use a laser in defense mode (Yu-gi-oh)
If you are of the age of 12 to 16 you can do the following steps: (Real life)
1. train in martial arts
2. run away from home and join a secret supernatural malisha
3. train with the secret supernatural malisha with weapons
4. Kill monsters with weapons.
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.