In SL, the Forest is the main place to gain experience, gold, gems, and many other things. You may slumber, thrillseek, look for something to kill, or search suicidally (once you have a certain amount of Orochimaru Kills).
- Slumming is looking for weaker enemies; when you slumber, most enemies will be a level lower than you, making them weaker and easier to kill, but you won't gain as much experience or gold.
- Looking for something to kill is looking for enemies who are mostly the same level as you. This is the most basic and most used option (also most suggested). You will gain an average amount of experience and gold this way.
- Thrillseeking is looking for a challenge, enemies who are mostly 1 level higher than you. You will recieve bonus experience and larger amounts of gold for killing these enemies.
- Searching suicidally is exactly as it's name states, suicide. You will face enemies who are mostly 2 levels higher than you. They could be extremely strong compared to you and there is a large chance you will need to use jutsus to beat these enemies. This is only suggested if you are desperate for experience and have some extra chakra.
All enemies in the forest are Naruto characters/enemies. Levels of the forest enemies will vary (as noted above) and after reaching a certain amount of Oro Kills, you may face multiple enemies.
In the forest, you can also recieve special events. There are all sorts of different special events, ranging from finding a gem to encountering a deadly assassin.
While you don't have to go to the forest, the forest is basically the only way you'll recieve any significant amount of experience or gold.