Among the many bosses in Old School RuneScape, Fire Giants are one of the best, if not the best, to farm. They are not overly difficult if you're prepared and they yield a lot of gold. This is the main reason why you'll see many players defeat them over and over again for extended periods of time.
This article contains every useful information you'll need to take on this task. If you're short on gold, I recommend doing a thorough read of this so you can if you're ready to take on a Fire Giant... and hopefully bag home a decent amount of gold!
https://expertgamereviews.com/a-guid...iants-in-osrs/