hi, i'm new in all this world and i want to start publishing assets, the problem is that I don't know how to handle the files ... in what kind of extension should i save them before publishing them as a package?
You mean what image format to use? Probably PNG, so people can do more processing before use without quality loss. They can easily convert to JPG if they're e.g. large textures or some such.
A percentage from what? The ideal resolution for an image depends very much on intended use, and people can easily resize images for themselves. What images are we talking anyway? Textures? Sprites? VN backgrounds?
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