Very nitpicky stuff (In osu!catch ranking criteria).
Your map must theoretically be possible to SS. This means it must be possible to catch absolutely all fruits, including droplets.
Due to the definitions of fruit and droplet in the ranking criteria, including a droplet as a fruit isn't correct, because a fruit is listed as "A large object represented by a hitcircle, slider head, tail or repeat.". It'd be better to word it as " This means it must be possible to catch absolutely all fruits, drops, and droplets." It's a little more long winded, but I couldn't really think of a shorter way to write it that doesn't lead to something being left out. (I also know that it's quite obvious what an SS means really, but if we're including an explanation I think it makes sense for it to be clarified properly.)
Overall Difficulty should have the same value as the Approach Rate. This is just a standardized value, as Overall Difficulty does not affect gameplay nor the amount of fruits a spinner has, just the maximum score of a difficulty. For cases where the two values are not equal, the Overall Difficulty must be less than or equal to the Overall Difficulty of the next hardest difficulty.
Similar thing here, "nor the amount of fruits a spinner has" goes against the definition of fruit, as bananas aren't listed under the fruit definition. Again, fairly obvious what is meant, but it's probably better to list as "nor the amount of bananas a spinner has", for the sake of definitions.
Use the same slider tick rate on every difficulty as it is a property of the music rather than the mapping. However, lower difficulties may use lower tick rates to reduce accuracy requirements for newer players, providing they still follow the rhythm of the song. Using high tick rates purely to increase score/combo/difficulty is senseless.
This being the only place in the general section which has the sentence carry on from the main part to the explanation seems really strange to me, and actually confused me a tiny bit when I was reading through until I realised. Maybe best to just make it "This is because it is a property of the music rather than the mapping.".