Be realistic with your choices, the fantasy section, as has already been mentioned, is a no go for anyone serious about their practice.
Many spells in the health category are also nonsensical, like the death spells and resurrection spells.
The spells in the trick category are definitely all fake, bar the rare one or two that may have some reality.
The Weather category is also made up majority with spells created with no real use in the world.
By the very nature of many of the categories, like trick, weather, fantasy, etc. You can safely say that most of these spells are useless.
But even in the categories that are more likely, it does not mean that there won't be fake spells and ideas, as always it is far better to write spells yourself than to rely on those found here.