One thing one must be very careful about is the use of a "dirty" mod. This is a mod which conflicts with another mod. (Obviously, if one does not plan on downloading other mods, or uploading their own, this shouldn't be a problem). For example, if a mod has nudged a rock or torch accidentally, or even on purpose, and a second mod has moved the rock or torch in a different way, these mods will conflict, and the modded game will register an error and crash. This is also very important to remember when making and uploading mods for others to use.